20938581056 has 28 divisors (see below), whose sum is σ = 41673333468. Its totient is φ = 10438213632.

The previous prime is 20938580989. The next prime is 20938581061. The reversal of 20938581056 is 65018583902.

It can be written as a sum of positive squares in 2 ways, for example, as 2924646400 + 18013934656 = 54080^2 + 134216^2 .

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20938581056.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 463841 + ... + 506976.

Almost surely, 2^20938581056 is an apocalyptic number.

It is an amenable number.

20938581056 is a deficient number, since it is larger than the sum of its proper divisors (20734752412).

20938581056 is an equidigital number, since it uses as much as digits as its factorization.

20938581056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 971166 (or 971156 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 47.

The spelling of 20938581056 in words is "twenty billion, nine hundred thirty-eight million, five hundred eighty-one thousand, fifty-six".