20500004644 has 24 divisors (see below), whose sum is σ = 41003070080. Its totient is φ = 8785060416.

The previous prime is 20500004639. The next prime is 20500004653. The reversal of 20500004644 is 44640000502.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 642337 + ... + 673495.

Almost surely, 2^20500004644 is an apocalyptic number.

It is an amenable number.

20500004644 is an abundant number, since it is smaller than the sum of its proper divisors (20503065436).

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

20500004644 is a wasteful number, since it uses less digits than its factorization.

20500004644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54667 (or 54665 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

The spelling of 20500004644 in words is "twenty billion, five hundred million, four thousand, six hundred forty-four".