31231312122020 has 96 divisors (see below), whose sum is σ = 72907218478080. Its totient is φ = 11184065988480.

The previous prime is 31231312122011. The next prime is 31231312122079. The reversal of 31231312122020 is 2022121313213.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20800946 + ... + 22251785.

It is an arithmetic number, because the mean of its divisors is an integer number (759450192480).

Almost surely, 2^{31231312122020} is an apocalyptic number.

It is an amenable number.

31231312122020 is an abundant number, since it is smaller than the sum of its proper divisors (41675906356060).

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

31231312122020 is a wasteful number, since it uses less digits than its factorization.

31231312122020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43052865 (or 43052863 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 31231312122020 its reverse (2022121313213), we get a palindrome (33253433435233).

The spelling of 31231312122020 in words is "thirty-one trillion, two hundred thirty-one billion, three hundred twelve million, one hundred twenty-two thousand, twenty".