20879904279 has 16 divisors (see below), whose sum is σ = 29992276832. Its totient is φ = 12844510848.

The previous prime is 20879904277. The next prime is 20879904281. The reversal of 20879904279 is 97240997802.

It is an interprime number because it is at equal distance from previous prime (20879904277) and next prime (20879904281).

It is not a de Polignac number, because 20879904279 - 2¹ = 20879904277 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 (20879904277) 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, 13377 + ... + 204789.

It is an arithmetic number, because the mean of its divisors is an integer number (1874517302).

Almost surely, 2^20879904279 is an apocalyptic number.

20879904279 is a deficient number, since it is larger than the sum of its proper divisors (9112372553).

20879904279 is a wasteful number, since it uses less digits than its factorization.

20879904279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194226.

The product of its (nonzero) digits is 4572288, while the sum is 57.

The spelling of 20879904279 in words is "twenty billion, eight hundred seventy-nine million, nine hundred four thousand, two hundred seventy-nine".