31156352020 has 48 divisors (see below), whose sum is σ = 66101531328. Its totient is φ = 12334533120.

The previous prime is 31156351973. The next prime is 31156352021. The reversal of 31156352020 is 2025365113.

It is a self number, because there is not a number n which added to its sum of digits gives 31156352020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31156352021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2499724 + ... + 2512156.

It is an arithmetic number, because the mean of its divisors is an integer number (1377115236).

Almost surely, 2^31156352020 is an apocalyptic number.

It is an amenable number.

31156352020 is an abundant number, since it is smaller than the sum of its proper divisors (34945179308).

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

31156352020 is a wasteful number, since it uses less digits than its factorization.

31156352020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13720 (or 13718 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 28.

The spelling of 31156352020 in words is "thirty-one billion, one hundred fifty-six million, three hundred fifty-two thousand, twenty".