20507776636 has 12 divisors (see below), whose sum is σ = 35892051328. Its totient is φ = 10252904832.

The previous prime is 20507776607. The next prime is 20507776643. The reversal of 20507776636 is 63667770502.

It is a happy number.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20507776636.

It is a congruent number.

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, 197916 + ... + 283171.

Almost surely, 2^20507776636 is an apocalyptic number.

It is an amenable number.

20507776636 is a deficient number, since it is larger than the sum of its proper divisors (15384274692).

20507776636 is a wasteful number, since it uses less digits than its factorization.

20507776636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491748 (or 491746 counting only the distinct ones).

The product of its (nonzero) digits is 2222640, while the sum is 49.

The spelling of 20507776636 in words is "twenty billion, five hundred seven million, seven hundred seventy-six thousand, six hundred thirty-six".