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20 (number): Map

  
  

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"Twenty" redirects here. For the village in Englandmarker, see Twenty, Lincolnshiremarker.
20 (twenty) is the natural number following 19 and preceding 21. A group of twenty units may also be referred to as a score.

In mathematics

  • An icosahedron has 20 faces. A dodecahedron has 20 vertices.
  • 20 can be written as the sum of three Fibonacci Numbers uniquely, i.e. 20 = 13 + 5 + 2.
  • The product of the number of divisors and the number of proper divisors of 20 is exactly 20.


In science



Biology

  • The number of proteinogenic amino acids that are encoded by the standard genetic code.
  • In some countries, the number 20 is used as an index in measuring visual acuity. 20/20 indicates normal vision at 20 feet, although it is commonly used to mean "perfect vision" (Note that this applies only to countries using the Imperial system. The metric equivalent is 6/6). When someone is able to see only after an event how things turned out, that person is often said to have had "20/20 hindsight".
  • There are 20 baby teeth in the deciduous dentition.


In religion



In sports



Age 20

  • Twenty is the age of majority in Japanesemarker tradition. Someone who is exactly twenty years old is described as hatachi
  • The age to be a adult in some cultures.


In other fields



20 is:

Historical years

20 A.D., 20 B.C., 1920, 2020, etc.

References




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