20013656321 has 16 divisors (see below), whose sum is σ = 20599790400. Its totient is φ = 19436109888.

The previous prime is 20013656303. The next prime is 20013656323. The reversal of 20013656321 is 12365631002.

It is a cyclic number.

It is not a de Polignac number, because 20013656321 - 2¹⁴ = 20013639937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20013656323) 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, 2552435 + ... + 2560263.

It is an arithmetic number, because the mean of its divisors is an integer number (1287486900).

Almost surely, 2^20013656321 is an apocalyptic number.

It is an amenable number.

20013656321 is a deficient number, since it is larger than the sum of its proper divisors (586134079).

20013656321 is a wasteful number, since it uses less digits than its factorization.

20013656321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8368.

The product of its (nonzero) digits is 6480, while the sum is 29.

The spelling of 20013656321 in words is "twenty billion, thirteen million, six hundred fifty-six thousand, three hundred twenty-one".