20881102656 has 56 divisors (see below), whose sum is σ = 55784357824. Its totient is φ = 6892784640.

The previous prime is 20881102607. The next prime is 20881102679. The reversal of 20881102656 is 65620118802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 508165 + ... + 547716.

Almost surely, 2^20881102656 is an apocalyptic number.

It is an amenable number.

20881102656 is an abundant number, since it is smaller than the sum of its proper divisors (34903255168).

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

20881102656 is a wasteful number, since it uses less digits than its factorization.

20881102656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1055999 (or 1055989 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 39.

The spelling of 20881102656 in words is "twenty billion, eight hundred eighty-one million, one hundred two thousand, six hundred fifty-six".