This nBAB was the

`th BAB of the Spring 2009 semester.`

220`BABs was a new record for BABs created during spring semesters and it was created with 24 days left in the semester.`

220MathBabbler Number Analyst (MBNA) output: ========================================= 220 is a natural, whole, integer 220 is even 220 proper divisors are: 1,2,4,5,10,11,20,22,44,55,110, 220 is abundant (sum of divisors is 284) 220 is unhappy 220 is a Harshad number 220 is not prime 220 has the prime factors: 2*2*5*11 (sum=20) 220 sum of prime factors is: 20 220 in octal is 0334 220 in hexadecimal is 0xdc 220 in binary is 11011100 (is odious) 220 nearest square numbers: -24...5 (196...225 [15]) sqrt(220) = 14.8324 ln(220) = 5.39363 log(220) = 2.34242 220 reciprocal is .00454545454545454545454545454545 220 is an apocalyptic power 220! is 2.28386e+421 220 is 70.0282 Pi years 220 is 11 scoreyears 220 written as a Roman numeral is CCXX

`[Wikipedia]`

`is the sum of four consecutive prime numbers (47 + 53 + 59 + 61).`

220

`[Wikipedia]`

`is an amicable number with 284 because the sum of the proper divisors for`

220`equals the sum of the proper divisors for 284.`

220`and 284 is the first (smallest) amicable pair.`

220OEIS.org::id:A063990

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

**Created:** 20 April 2009

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