20928685056 has 176 divisors, whose sum is σ = 57224294400. Its totient is φ = 6798385152.

The previous prime is 20928685039. The next prime is 20928685081. The reversal of 20928685056 is 65058682902.

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, 20142585 + ... + 20143623.

Almost surely, 2^20928685056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20928685056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28612147200).

20928685056 is an abundant number, since it is smaller than the sum of its proper divisors (36295609344).

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

20928685056 is a wasteful number, since it uses less digits than its factorization.

20928685056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1224 (or 1206 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 51.

The spelling of 20928685056 in words is "twenty billion, nine hundred twenty-eight million, six hundred eighty-five thousand, fifty-six".