While creating a nBAB for the 220, MathBabbler learned that 220 was an amicable number with

`. In other words, the sum of the proper divisors of 220 equals the sum of the proper divisors of`

284`.`

284MathBabbler Number Analyst (MBNA) output: ========================================= 284 is a natural, whole, integer 284 is even 284 proper divisors are: 1,2,4,71,142, 284 is deficient (sum of divisors is 220) 284 is unhappy 284 is not a Harshad number 284 is not prime 284 has the prime factors: 2*2*71 (sum=75) 284 sum of prime factors is: 75 284 in octal is 0434 284 in hexadecimal is 0x11c 284 in binary is 100011100 (is evil) 284 nearest square numbers: -28...5 (256...289 [17]) sqrt(284) = 16.8523 ln(284) = 5.64897 log(284) = 2.45332 284 reciprocal is .00352112676056338028169014084507 284! is 1.0682e+575 284 is 90.4 Pi years 284 is 14 score and 4 years 284 written as a Roman numeral is CCLXXXIV

`and 220 are the smallest amicable pair.`

284

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

**Created:** 20 April 2009

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