### About the Number 220 (two hundred twenty)

This nBAB was the `220`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.

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

`[Wikipedia]` `220` 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.

OEIS.org::id:A063990

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 20 April 2009 