31013031020 has 48 divisors (see below), whose sum is σ = 66242292480. Its totient is φ = 12193646784.

The previous prime is 31013030959. The next prime is 31013031041. The reversal of 31013031020 is 2013031013.

It is a junction number, because it is equal to n+sod(n) for n = 31013030986 and 31013031004.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 601001 + ... + 650559.

It is an arithmetic number, because the mean of its divisors is an integer number (1380047760).

Almost surely, 2^31013031020 is an apocalyptic number.

It is an amenable number.

31013031020 is an abundant number, since it is smaller than the sum of its proper divisors (35229261460).

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

31013031020 is a wasteful number, since it uses less digits than its factorization.

31013031020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50102 (or 50100 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 14.

Adding to 31013031020 its reverse (2013031013), we get a palindrome (33026062033).

The spelling of 31013031020 in words is "thirty-one billion, thirteen million, thirty-one thousand, twenty".