20104090056 has 128 divisors (see below), whose sum is σ = 58580582400. Its totient is φ = 6376138560.

The previous prime is 20104090031. The next prime is 20104090063. The reversal of 20104090056 is 65009040102.

20104090056 is a `hidden beast` number, since 201 + 0 + 409 + 0 + 0 + 56 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 938295 + ... + 959481.

It is an arithmetic number, because the mean of its divisors is an integer number (457660800).

Almost surely, 2^20104090056 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 20104090056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29290291200).

20104090056 is an abundant number, since it is smaller than the sum of its proper divisors (38476492344).

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

20104090056 is a wasteful number, since it uses less digits than its factorization.

20104090056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21416 (or 21406 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The spelling of 20104090056 in words is "twenty billion, one hundred four million, ninety thousand, fifty-six".