231320320 has 144 divisors (see below), whose sum is σ = 691100928. Its totient is φ = 72069120.

The previous prime is 231320317. The next prime is 231320329. The reversal of 231320320 is 23023132.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 231320294 and 231320303.

It is not an unprimeable number, because it can be changed into a prime (231320329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97387 + ... + 99733.

It is an arithmetic number, because the mean of its divisors is an integer number (4799312).

Almost surely, 2^231320320 is an apocalyptic number.

231320320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231320320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (345550464).

231320320 is an abundant number, since it is smaller than the sum of its proper divisors (459780608).

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

231320320 is a wasteful number, since it uses less digits than its factorization.

231320320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2386 (or 2372 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 231320320 is about 15209.2182573596. The cubic root of 231320320 is about 613.8627229379.

Adding to 231320320 its reverse (23023132), we get a palindrome (254343452).

The spelling of 231320320 in words is "two hundred thirty-one million, three hundred twenty thousand, three hundred twenty".