CREATOR: @the_accountant

Twenty

Historical Significance: 20 (twenty; Roman numeral XX) 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 • 20 is a pronic number. • 20 is a tetrahedral number as 1, 4, 10, 20. • 20 is the basis for vigesimal number systems. • 20 is the third composite number to be the product of a squared prime and a prime, and also the second member of the (22)q family in this form. • 20 is the smallest primitive abundant number. • An icosahedron has 20 faces.[7] 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. • 20 is the number of moves (quarter or half turns) required to optimally solve a Rubik's Cube in the worst case. In science • The atomic number of calcium. • The third magic number in physics. • The International Astronomical Union shower number for Coma Berenicids. 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". Age 20 • In many disciplines of developmental psychology, adulthood starts at age 20. This hand drawn (with mouse) using sophisticated software (paint) was created as an exclusive NFT by The Accountant. Collection: The Numbers Use Case: Good for Counting Rarity: Common Minted on July 3, 2021 during the first week of Enter.art