20931718976 has 56 divisors (see below), whose sum is σ = 47484767616. Its totient is φ = 8967974400.

The previous prime is 20931718967. The next prime is 20931718987. The reversal of 20931718976 is 67981713902.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2213330 + ... + 2222766.

Almost surely, 2^20931718976 is an apocalyptic number.

It is an amenable number.

20931718976 is an abundant number, since it is smaller than the sum of its proper divisors (26553048640).

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

20931718976 is an equidigital number, since it uses as much as digits as its factorization.

20931718976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14407 (or 14397 counting only the distinct ones).

The product of its (nonzero) digits is 1143072, while the sum is 53.

The spelling of 20931718976 in words is "twenty billion, nine hundred thirty-one million, seven hundred eighteen thousand, nine hundred seventy-six".