231231020 has 24 divisors (see below), whose sum is σ = 486347568. Its totient is φ = 92347200.

The previous prime is 231231017. The next prime is 231231031. The reversal of 231231020 is 20132132.

It is a happy number.

It is a super-2 number, since 2×231231020² = 106935569220480800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231230986 and 231231004.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4475 + ... + 21965.

It is an arithmetic number, because the mean of its divisors is an integer number (20264482).

Almost surely, 2^231231020 is an apocalyptic number.

231231020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231231020 is an abundant number, since it is smaller than the sum of its proper divisors (255116548).

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

231231020 is a wasteful number, since it uses less digits than its factorization.

231231020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18161 (or 18159 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 231231020 is about 15206.2822543842. The cubic root of 231231020 is about 613.7837199393.

Adding to 231231020 its reverse (20132132), we get a palindrome (251363152).

The spelling of 231231020 in words is "two hundred thirty-one million, two hundred thirty-one thousand, twenty".