20507756636 has 24 divisors (see below), whose sum is σ = 36217134240. Its totient is φ = 10160059392.

The previous prime is 20507756627. The next prime is 20507756669. The reversal of 20507756636 is 63665770502.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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, 2494100 + ... + 2502308.

It is an arithmetic number, because the mean of its divisors is an integer number (1509047260).

Almost surely, 2^20507756636 is an apocalyptic number.

It is an amenable number.

20507756636 is a deficient number, since it is larger than the sum of its proper divisors (15709377604).

20507756636 is a wasteful number, since it uses less digits than its factorization.

20507756636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13853 (or 13851 counting only the distinct ones).

The product of its (nonzero) digits is 1587600, while the sum is 47.

The spelling of 20507756636 in words is "twenty billion, five hundred seven million, seven hundred fifty-six thousand, six hundred thirty-six".