231020320 has 48 divisors (see below), whose sum is σ = 546715008. Its totient is φ = 92250880.

The previous prime is 231020311. The next prime is 231020329. The reversal of 231020320 is 23020132.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (231020311) and next prime (231020329).

It is a self number, because there is not a number n which added to its sum of digits gives 231020320.

It is not an unprimeable number, because it can be changed into a prime (231020329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154617 + ... + 156103.

It is an arithmetic number, because the mean of its divisors is an integer number (11389896).

Almost surely, 2^231020320 is an apocalyptic number.

231020320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231020320 is an abundant number, since it is smaller than the sum of its proper divisors (315694688).

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

231020320 is a wasteful number, since it uses less digits than its factorization.

231020320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2473 (or 2465 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 231020320 is about 15199.3526177926. The cubic root of 231020320 is about 613.5972346800.

Adding to 231020320 its reverse (23020132), we get a palindrome (254040452).

The spelling of 231020320 in words is "two hundred thirty-one million, twenty thousand, three hundred twenty".