31577638020 has 48 divisors (see below), whose sum is σ = 89328922368. Its totient is φ = 8333890560.

The previous prime is 31577638007. The next prime is 31577638061. The reversal of 31577638020 is 2083677513.

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, 2707036 + ... + 2718675.

It is an arithmetic number, because the mean of its divisors is an integer number (1861019216).

Almost surely, 2^31577638020 is an apocalyptic number.

31577638020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31577638020 is an abundant number, since it is smaller than the sum of its proper divisors (57751284348).

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

31577638020 is a wasteful number, since it uses less digits than its factorization.

31577638020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5425820 (or 5425818 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 42.

The spelling of 31577638020 in words is "thirty-one billion, five hundred seventy-seven million, six hundred thirty-eight thousand, twenty".