231372220 has 24 divisors (see below), whose sum is σ = 501556608. Its totient is φ = 89563200.

The previous prime is 231372209. The next prime is 231372221. The reversal of 231372220 is 22273132.

It is a junction number, because it is equal to n+sod(n) for n = 231372191 and 231372200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231372221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185971 + ... + 187210.

It is an arithmetic number, because the mean of its divisors is an integer number (20898192).

Almost surely, 2^231372220 is an apocalyptic number.

231372220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231372220 is an abundant number, since it is smaller than the sum of its proper divisors (270184388).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231372220 is a wasteful number, since it uses less digits than its factorization.

231372220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373221 (or 373219 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 231372220 is about 15210.9243637591. The cubic root of 231372220 is about 613.9086291124.

The spelling of 231372220 in words is "two hundred thirty-one million, three hundred seventy-two thousand, two hundred twenty".