13656664020 has 48 divisors (see below), whose sum is σ = 38391046848. Its totient is φ = 3627264000.

The previous prime is 13656664001. The next prime is 13656664027. The reversal of 13656664020 is 2046665631.

It is a self number, because there is not a number n which added to its sum of digits gives 13656664020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13656664027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 438349 + ... + 468468.

It is an arithmetic number, because the mean of its divisors is an integer number (799813476).

Almost surely, 2^13656664020 is an apocalyptic number.

13656664020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13656664020 is an abundant number, since it is smaller than the sum of its proper divisors (24734382828).

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

13656664020 is a wasteful number, since it uses less digits than its factorization.

13656664020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907080 (or 907078 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 39.

The spelling of 13656664020 in words is "thirteen billion, six hundred fifty-six million, six hundred sixty-four thousand, twenty".