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

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

20MathBabbler's last name starts with the

`th letter of the alphabet (i.e. 'T').`

20

**Creator:** Gerald Thurman
[gthurman@gmail.com]

**Created:** 27 December 2008

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