20575956856 has 96 divisors (see below), whose sum is σ = 47818339200. Its totient is φ = 8127250560.

The previous prime is 20575956827. The next prime is 20575956857. The reversal of 20575956856 is 65865957502.

It is a self number, because there is not a number n which added to its sum of digits gives 20575956856.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20575956857) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8128311 + ... + 8130841.

It is an arithmetic number, because the mean of its divisors is an integer number (498107700).

Almost surely, 2^20575956856 is an apocalyptic number.

20575956856 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20575956856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23909169600).

20575956856 is an abundant number, since it is smaller than the sum of its proper divisors (27242382344).

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

20575956856 is a wasteful number, since it uses less digits than its factorization.

20575956856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3429 (or 3412 counting only the distinct ones).

The product of its (nonzero) digits is 22680000, while the sum is 58.

The spelling of 20575956856 in words is "twenty billion, five hundred seventy-five million, nine hundred fifty-six thousand, eight hundred fifty-six".