20711815056 has 135 divisors (see below), whose sum is σ = 59172932091. Its totient is φ = 6762900672.

The previous prime is 20711815043. The next prime is 20711815057. The reversal of 20711815056 is 65051811702.

20711815056 = 1³ + 2³ + ... + 536³.

The square root of 20711815056 is 143916.

It is a perfect power (a square), and thus also a powerful number.

20711815056 is a `hidden beast` number, since 2 + 0 + 71 + 1 + 81 + 505 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 20711815056.

It is not an unprimeable number, because it can be changed into a prime (20711815057) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 115708375 + ... + 115708553.

Almost surely, 2^20711815056 is an apocalyptic number.

20711815056 is the 143916-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20711815056

20711815056 is an abundant number, since it is smaller than the sum of its proper divisors (38461117035).

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

20711815056 is an equidigital number, since it uses as much as digits as its factorization.

20711815056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506 (or 251 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 36.

Multiplying 20711815056 by its sum of digits (36), we get a square (745625342016 = 863496²).

20711815056 divided by its sum of digits (36) gives a square (575328196 = 23986²).

The spelling of 20711815056 in words is "twenty billion, seven hundred eleven million, eight hundred fifteen thousand, fifty-six".