# Trivia About the Number 20

“Our lives our governed by numbers,” writes Herb Reich in the introduction to Numberpedia, “Not the evanescent assumptions of the numerologist, but the widely applied codified numerical systems underlying our very existence… Numbers serve two functions: they may denote measurements or designations. Thus, they both quantify and identify.” So what does that really mean? It means that to our own circle of family and friends, we are known by our names — but we are just numbers to everyone else. For example, each person is identified with a social security number, a customer number, a student number, a driver’s license number, an account number, an IP address, a physical address, and so on. Furthermore, each person is described by numbers unique to them; for example, a credit score, a test score (SAT, GRE, PSAT), GPA, IQ, weight, height, blood pressure, heart beat rate, and so forth. Since Reich is fascinated by numbers, he decided to write a book that examines the various meaning and associations of numbers, from 0 to 100. Since we have just ushered in the year 2020, let’s see what associations the number 20 has (listed in no particular order):

The base of the Mayan number system

Number of days in each of the 18 months in the Mayan calendar

The sum of the first seven Fibonacci numbers

The atomic number of calcium

Value of Roman numeral XX

Fluid ounces in a pint (British measure)

The age of majority (hatachi) in Japanese society

Number comprising a score (recall Lincoln’s Gettysburg address: “Four score and seven years ago…” meaning 87 years)

Number of first moves possible for each player in the game of chess

Number of human baby teeth

Number of pennyweights in an ounce troy

The number of quires in a ream of paper

Measure of visual acuity (normal vision at 20 feet for left eye and right eye is 20/20)

A dart board is divided into 20 sectors

An icosahedron is a 20-sided die, each side containing an equilateral triangle (one is found floating inside the Magic 8-Ball)

A dodecahedron is a solid with 20 corners

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For further reading: Numberpedia by Herb Reich
https://badseypublications.co.uk/number/Num20.htm
https://en.wikipedia.org/wiki/20_(number)

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