31103132020 has 48 divisors (see below), whose sum is σ = 65628754128. Its totient is φ = 12381880320.

The previous prime is 31103131957. The next prime is 31103132063. The reversal of 31103132020 is 2023130113.

It can be written as a sum of positive squares in 8 ways, for example, as 5296637284 + 25806494736 = 72778^2 + 160644^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31103131985 and 31103132003.

It is a congruent number.

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, 8330074 + ... + 8333806.

It is an arithmetic number, because the mean of its divisors is an integer number (1367265711).

Almost surely, 2^31103132020 is an apocalyptic number.

It is an amenable number.

31103132020 is an abundant number, since it is smaller than the sum of its proper divisors (34525622108).

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

31103132020 is a wasteful number, since it uses less digits than its factorization.

31103132020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5620 (or 5618 counting only the distinct ones).

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

Adding to 31103132020 its reverse (2023130113), we get a palindrome (33126262133).

The spelling of 31103132020 in words is "thirty-one billion, one hundred three million, one hundred thirty-two thousand, twenty".