20557256445 has 48 divisors (see below), whose sum is σ = 39699009792. Its totient is φ = 9755076480.

The previous prime is 20557256437. The next prime is 20557256471. The reversal of 20557256445 is 54465275502.

20557256445 is a `hidden beast` number, since 2 + 0 + 557 + 2 + 56 + 4 + 45 = 666.

It is not a de Polignac number, because 20557256445 - 2³ = 20557256437 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 20557256445.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 418542 + ... + 465071.

It is an arithmetic number, because the mean of its divisors is an integer number (827062704).

Almost surely, 2^20557256445 is an apocalyptic number.

It is an amenable number.

20557256445 is a deficient number, since it is larger than the sum of its proper divisors (19141753347).

20557256445 is a wasteful number, since it uses less digits than its factorization.

20557256445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883682 (or 883679 counting only the distinct ones).

The product of its (nonzero) digits is 1680000, while the sum is 45.

The spelling of 20557256445 in words is "twenty billion, five hundred fifty-seven million, two hundred fifty-six thousand, four hundred forty-five".