About the Number 20 (twenty)

The 20 mile long Valley Metro light-rail starting running on 27 December 2008.

   MathBabbler Number Analyst (MBNA) output:
   =========================================
   20 is a natural, whole, integer
   20 is even
   20 proper divisors are: 1,2,4,5,10,
   20 is abundant (sum of divisors is 22)
   20 is unhappy
   20 is a Harshad number
   20 is not prime
   20 is undulating
   20 has the prime factors: 2*2*5
   20 in octal is 024
   20 in hexadecimal is 0x14
   20 in binary is 10100 (is evil)
   20 nearest square numbers: -4...5 (16...25 [5])
   sqrt(20) = 4.47214
   ln(20) = 2.99573
   log(20) = 1.30103
   20 reciprocal is .05000000000000000000000000000000
   20! is 2.4329e+18
   20 is 6.3662 Pi years
   20 is 1 scoreyear
   20 written as a Roman numeral is XX

20 seems like an awkward age--not a teenager, yet one year shy of legal drinking age.

MathBabbler's last name starts with the 20th letter of the alphabet (i.e. 'T').


Creator: Gerald Thurman [gthurman@gmail.com]
Created: 27 December 2008

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This work is licensed under a Creative Commons Attribution 3.0 United States License.