31130312020 has 24 divisors (see below), whose sum is σ = 65391031944. Its totient is φ = 12448814976.

The previous prime is 31130311997. The next prime is 31130312039. The reversal of 31130312020 is 2021303113.

It can be written as a sum of positive squares in 4 ways, for example, as 4159476036 + 26970835984 = 64494^2 + 164228^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31130311985 and 31130312003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129027 + ... + 280906.

It is an arithmetic number, because the mean of its divisors is an integer number (2724626331).

Almost surely, 2^31130312020 is an apocalyptic number.

It is an amenable number.

31130312020 is an abundant number, since it is smaller than the sum of its proper divisors (34260719924).

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

31130312020 is a wasteful number, since it uses less digits than its factorization.

31130312020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413739 (or 413737 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 31130312020 its reverse (2021303113), we get a palindrome (33151615133).

It can be divided in two parts, 311303 and 12020, that added together give a palindrome (323323).

The spelling of 31130312020 in words is "thirty-one billion, one hundred thirty million, three hundred twelve thousand, twenty".