20879369621 has 16 divisors (see below), whose sum is σ = 24277097088. Its totient is φ = 17746368000.

The previous prime is 20879369611. The next prime is 20879369633. The reversal of 20879369621 is 12696397802.

It is a happy number.

It is not a de Polignac number, because 20879369621 - 2²⁶ = 20812260757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20879369611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 341480 + ... + 397953.

It is an arithmetic number, because the mean of its divisors is an integer number (1517318568).

Almost surely, 2^20879369621 is an apocalyptic number.

It is an amenable number.

20879369621 is a deficient number, since it is larger than the sum of its proper divisors (3397727467).

20879369621 is a wasteful number, since it uses less digits than its factorization.

20879369621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 739612.

The product of its (nonzero) digits is 1959552, while the sum is 53.

The spelling of 20879369621 in words is "twenty billion, eight hundred seventy-nine million, three hundred sixty-nine thousand, six hundred twenty-one".