20640637677230 has 16 divisors (see below), whose sum is σ = 37854150609024. Its totient is φ = 8100476673120.

The previous prime is 20640637677173. The next prime is 20640637677263. The reversal of 20640637677230 is 3277673604602.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19472299166 + ... + 19472300225.

It is an arithmetic number, because the mean of its divisors is an integer number (2365884413064).

Almost surely, 2^{20640637677230} is an apocalyptic number.

20640637677230 is a deficient number, since it is larger than the sum of its proper divisors (17213512931794).

20640637677230 is a wasteful number, since it uses less digits than its factorization.

20640637677230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38944599451.

The product of its (nonzero) digits is 10668672, while the sum is 53.

The spelling of 20640637677230 in words is "twenty trillion, six hundred forty billion, six hundred thirty-seven million, six hundred seventy-seven thousand, two hundred thirty".