231313220 has 96 divisors (see below), whose sum is σ = 551214720. Its totient is φ = 81008640.

The previous prime is 231313213. The next prime is 231313223. The reversal of 231313220 is 22313132.

231313220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is not an unprimeable number, because it can be changed into a prime (231313223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 393767 + ... + 394353.

It is an arithmetic number, because the mean of its divisors is an integer number (5741820).

Almost surely, 2^231313220 is an apocalyptic number.

231313220 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 231313220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (275607360).

231313220 is an abundant number, since it is smaller than the sum of its proper divisors (319901500).

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

231313220 is a wasteful number, since it uses less digits than its factorization.

231313220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 693 (or 691 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 231313220 is about 15208.9848444924. The cubic root of 231313220 is about 613.8564423686.

Adding to 231313220 its reverse (22313132), we get a palindrome (253626352).

The spelling of 231313220 in words is "two hundred thirty-one million, three hundred thirteen thousand, two hundred twenty".