20612813256 has 448 divisors, whose sum is σ = 71581881600. Its totient is φ = 5431878144.

The previous prime is 20612813239. The next prime is 20612813281. The reversal of 20612813256 is 65231821602.

20612813256 is a `hidden beast` number, since 2 + 0 + 612 + 8 + 1 + 32 + 5 + 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 20612813256.

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 27229230 + ... + 27229986.

Almost surely, 2^20612813256 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 20612813256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35790940800).

20612813256 is an abundant number, since it is smaller than the sum of its proper divisors (50969068344).

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

20612813256 is a wasteful number, since it uses less digits than its factorization.

20612813256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840 (or 821 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 20612813256 in words is "twenty billion, six hundred twelve million, eight hundred thirteen thousand, two hundred fifty-six".