40 Interesting Facts About Number 20


Number 20

40 Interesting Facts About Number 20

  • In Australian Rules Football (AFL) a game is made up of four 20 minute quarters.
  • In the US college basketball is governed by a few different organizations. Under the NCAA basketball rules, a game is made up of two 20 minute halves.
  • Ice Hockey rules, on the other hand, stipulate three 20 minute thirds!
  • The number 20 is also sometimes called a score, particularly in older English literature.
  • Twenty is the number that is after nineteen and before twenty-one.
  • The prime factors of twenty are 2 and 5. (2 * 2 * 5 = 20)
  • Its factors are: 1, 2, 4, 5, 10, and 20. As the sum of its factors is more than itself (i.e. 22), it can be referred to as an abundant number.
  • It is the number of milk teeth in an infant’s mouth.
  • In Roman numerals, 20 is written as XX.
  • The UK’s £20 banknote has a picture of Adam Smith on it. Adam Smith was a famous philosopher, economist, and writer. On February 20, 2020, the paper £20 note was replaced by a polymer note.
  • In the far south of the district of Lincolnshire, UK, lies the hamlet of Twenty. A hamlet is defined as being either a small or a very small human settlement. Twenty is so small that there is no official record of how many people live there.
  • The Wikipedia page for a complete and utterly insignificant hamlet called Twenty, Lincolnshire, is longer than the entire Wikipedia entry for 20 (the number).
  • The atomic number of the chemical element Calcium is 20. Calcium is actually a metal that’s alkaline in nature, but most people are familiar with it due to its high concentration in milk.
  • If someone has 20/20 vision it means that they have perfect eyesight. The idea behind this is that if you can read a specific set of letters on a chart at a distance of 20 feet, then your vision couldn’t get any better! Although the metric equivalent of this would be 6/6, with perfect vision at 6 meters, most countries that use the metric system still refer to it as 20/20.
  • If you’re only good at seeing what happens only after it’s happened then you’re said to have 20/20 hindsight.
  • Twenty20 is something different altogether, even though it sounds the same out loud. It actually refers to a specific variation of the game of cricket, where each team is only allowed to play for 20 overs in total.
  • In Japanese tradition, adulthood is established at the age of 20. See seijin not hi (the celebration of adulthood in Japan).
  • If you want to call anyone in Egypt, don’t forget the number 20! When you call, you must dial +20 before dialing a phone number.
  • Prepare for an absolute shocker of a fact – in the game Twenty Questions there are, in fact, twenty questions!
  • Have you ever picked up a Rubik’s Cube and struggled away at it for hours on end? It turns out that a Rubik’s Cube can always be solved in 20 moves or less, no matter how mixed up it is!
  • In the sixteenth century, a Hungarian king called Mathius Corvinus declared that one in every twenty households was required to furnish his army with a fully armed soldier and a horse. The Hungarian word for 20 is husz, and these soldiers on horseback became known as hussars.
  • According to developmental psychology, we’re not adults until we reach the age of 20. Developmental psychology is a form of science that studies how and why we change throughout our lives.
  • The age of majority, which is the age one legally becomes an adult, used to be 20 in Japan. In 2018 this was changed and now it is 18.
  • There are a total of 20 different possible moves that you can legally play at the beginning of a game of chess.
  • A 20th wedding anniversary is referred to as a China Anniversary. It’s a tradition on a China anniversary to give your husband or wife something made out of china.
  • A shape with 20 sides, or faces, is called an icosahedron. Every face of an icosahedron is an equilateral triangle.
  • 20 can been used as a number base. Remnants of this system remain in some European languages, for example in the English “score” (20) and the French “quatre-vingts” (80, literally four groups of twenty). The old (pre-decimal) English monetary system had twenty shillings in a pound. The ancient Mayan numerical system – counting on fingers and toes – was a base 20 or "vigesimal" system.
  • A polyhedron of 20 faces is an icosahedron, one of the five Platonic solids. It is a convex regular polyhedron composed of twenty triangular faces, with five meeting at each of the twelve vertices. It has 30 edges and 12 vertices. Its dual polyhedron is the dodecahedron.
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