![]() In some countries, the number 20 is used as an index in measuring visual acuity.The number of proteinogenic amino acids that are encoded by the standard genetic code.The International Astronomical Union shower number for Coma Berenicids.20 is the number of parallelogram polyominoes with 5 cells.20 is the number of moves (quarter or half turns) required to optimally solve a Rubik's Cube in the worst case.20 can be written as the sum of three Fibonacci numbers uniquely, i.e.20 is the smallest primitive abundant number. ![]() 20 is the third composite number to be the product of a squared prime and a prime, and also the second member of the ( 2 2) q family in this form.20 is the basis for vigesimal number systems.20 is a tetrahedral number as 1, 4, 10, 20.
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