20787153696 has 72 divisors (see below), whose sum is σ = 59144265180. Its totient is φ = 6925441536.

The previous prime is 20787153683. The next prime is 20787153707. The reversal of 20787153696 is 69635178702.

20787153696 is a `hidden beast` number, since 20 + 7 + 87 + 1 + 536 + 9 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20237907600 + 549246096 = 142260^2 + 23436^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×20787153696² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 566566 + ... + 602138.

Almost surely, 2^20787153696 is an apocalyptic number.

It is an amenable number.

20787153696 is an abundant number, since it is smaller than the sum of its proper divisors (38357111484).

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

20787153696 is a wasteful number, since it uses less digits than its factorization.

20787153696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37618 (or 37607 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 54.

The spelling of 20787153696 in words is "twenty billion, seven hundred eighty-seven million, one hundred fifty-three thousand, six hundred ninety-six".