220451231 has 24 divisors (see below), whose sum is σ = 298247712. Its totient is φ = 158558400.

The previous prime is 220451207. The next prime is 220451233. The reversal of 220451231 is 132154022.

It is not a de Polignac number, because 220451231 - 2²² = 216256927 is a prime.

It is a super-2 number, since 2×220451231² = 97197490498830722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (20) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220451233) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1001 + ... + 21021.

It is an arithmetic number, because the mean of its divisors is an integer number (12426988).

Almost surely, 2^220451231 is an apocalyptic number.

220451231 is a deficient number, since it is larger than the sum of its proper divisors (77796481).

220451231 is a wasteful number, since it uses less digits than its factorization.

220451231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20063 (or 20052 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 220451231 is about 14847.6001764595. The cubic root of 220451231 is about 604.0935185152.

It can be divided in two parts, 2204 and 51231, that added together give a palindrome (53435).

The spelling of 220451231 in words is "two hundred twenty million, four hundred fifty-one thousand, two hundred thirty-one".