20056638720 has 72 divisors (see below), whose sum is σ = 64055902176. Its totient is φ = 5348435968.

The previous prime is 20056638691. The next prime is 20056638731. The reversal of 20056638720 is 2783665002.

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, 2607702 + ... + 2615381.

It is an arithmetic number, because the mean of its divisors is an integer number (889665308).

Almost surely, 2^20056638720 is an apocalyptic number.

20056638720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20056638720 is an abundant number, since it is smaller than the sum of its proper divisors (43999263456).

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

20056638720 is an equidigital number, since it uses as much as digits as its factorization.

20056638720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5223107 (or 5223093 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 39.

The spelling of 20056638720 in words is "twenty billion, fifty-six million, six hundred thirty-eight thousand, seven hundred twenty".