20156710656 has 72 divisors (see below), whose sum is σ = 53670730624. Its totient is φ = 6715837440.

The previous prime is 20156710591. The next prime is 20156710657. The reversal of 20156710656 is 65601765102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20156710657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2212671 + ... + 2221761.

Almost surely, 2^20156710656 is an apocalyptic number.

It is an amenable number.

20156710656 is an abundant number, since it is smaller than the sum of its proper divisors (33514019968).

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

20156710656 is an equidigital number, since it uses as much as digits as its factorization.

20156710656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11997 (or 11983 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 39.

The spelling of 20156710656 in words is "twenty billion, one hundred fifty-six million, seven hundred ten thousand, six hundred fifty-six".