20644165103604 has 24 divisors (see below), whose sum is σ = 55051106943168. Its totient is φ = 5898332886720.

The previous prime is 20644165103587. The next prime is 20644165103623. The reversal of 20644165103604 is 40630156144602.

It is a super-2 number, since 2×20644165103604² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 122881935057 + ... + 122881935224.

It is an arithmetic number, because the mean of its divisors is an integer number (2293796122632).

Almost surely, 2^{20644165103604} is an apocalyptic number.

It is an amenable number.

20644165103604 is an abundant number, since it is smaller than the sum of its proper divisors (34406941839564).

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

20644165103604 is a wasteful number, since it uses less digits than its factorization.

20644165103604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245763870295 (or 245763870293 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 42.

The spelling of 20644165103604 in words is "twenty trillion, six hundred forty-four billion, one hundred sixty-five million, one hundred three thousand, six hundred four".