231133320 has 96 divisors (see below), whose sum is σ = 819486720. Its totient is φ = 56031360.

The previous prime is 231133319. The next prime is 231133327. The reversal of 231133320 is 23331132.

231133320 is a `hidden beast` number, since 2 + 311 + 33 + 320 = 666.

It is a super-2 number, since 2×231133320² = 106845223228444800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 231133293 and 231133302.

It is not an unprimeable number, because it can be changed into a prime (231133327) 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, 25224 + ... + 33143.

It is an arithmetic number, because the mean of its divisors is an integer number (8536320).

Almost surely, 2^231133320 is an apocalyptic number.

231133320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231133320 is an abundant number, since it is smaller than the sum of its proper divisors (588353400).

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

231133320 is a wasteful number, since it uses less digits than its factorization.

231133320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58395 (or 58388 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

The square root of 231133320 is about 15203.0694269282. The cubic root of 231133320 is about 613.6972622240.

Adding to 231133320 its reverse (23331132), we get a palindrome (254464452).

The spelling of 231133320 in words is "two hundred thirty-one million, one hundred thirty-three thousand, three hundred twenty".