31697683020 has 288 divisors, whose sum is σ = 102694265856. Its totient is φ = 8202124800.

The previous prime is 31697682937. The next prime is 31697683063. The reversal of 31697683020 is 2038679613.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 53999167 + ... + 53999753.

It is an arithmetic number, because the mean of its divisors is an integer number (356577312).

Almost surely, 2^31697683020 is an apocalyptic number.

31697683020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31697683020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51347132928).

31697683020 is an abundant number, since it is smaller than the sum of its proper divisors (70996582836).

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

31697683020 is a wasteful number, since it uses less digits than its factorization.

31697683020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923 (or 909 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The spelling of 31697683020 in words is "thirty-one billion, six hundred ninety-seven million, six hundred eighty-three thousand, twenty".