20971313888 has 48 divisors (see below), whose sum is σ = 49237009920. Its totient is φ = 8596934016.

The previous prime is 20971313729. The next prime is 20971313893. The reversal of 20971313888 is 88831317902.

It is a congruent number.

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, 2030108 + ... + 2040411.

It is an arithmetic number, because the mean of its divisors is an integer number (1025771040).

Almost surely, 2^20971313888 is an apocalyptic number.

20971313888 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20971313888 is an abundant number, since it is smaller than the sum of its proper divisors (28265696032).

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

20971313888 is a wasteful number, since it uses less digits than its factorization.

20971313888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4070559 (or 4070551 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 50.

The spelling of 20971313888 in words is "twenty billion, nine hundred seventy-one million, three hundred thirteen thousand, eight hundred eighty-eight".