20005645256 has 16 divisors (see below), whose sum is σ = 37522143600. Its totient is φ = 9999740304.

The previous prime is 20005645213. The next prime is 20005645279. The reversal of 20005645256 is 65254650002.

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, 357590 + ... + 409733.

It is an arithmetic number, because the mean of its divisors is an integer number (2345133975).

Almost surely, 2^20005645256 is an apocalyptic number.

It is an amenable number.

20005645256 is a deficient number, since it is larger than the sum of its proper divisors (17516498344).

20005645256 is a wasteful number, since it uses less digits than its factorization.

20005645256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770588 (or 770584 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 35.

The spelling of 20005645256 in words is "twenty billion, five million, six hundred forty-five thousand, two hundred fifty-six".