31397319020 has 24 divisors (see below), whose sum is σ = 66574513824. Its totient is φ = 12436995456.

The previous prime is 31397319013. The next prime is 31397319077. The reversal of 31397319020 is 2091379313.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7618649 + ... + 7622768.

It is an arithmetic number, because the mean of its divisors is an integer number (2773938076).

Almost surely, 2^31397319020 is an apocalyptic number.

It is an amenable number.

31397319020 is an abundant number, since it is smaller than the sum of its proper divisors (35177194804).

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

31397319020 is a wasteful number, since it uses less digits than its factorization.

31397319020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15241529 (or 15241527 counting only the distinct ones).

The product of its (nonzero) digits is 30618, while the sum is 38.

The spelling of 31397319020 in words is "thirty-one billion, three hundred ninety-seven million, three hundred nineteen thousand, twenty".