20879904280 has 32 divisors (see below), whose sum is σ = 46996880400. Its totient is φ = 8348922496.

The previous prime is 20879904277. The next prime is 20879904281. The reversal of 20879904280 is 8240997802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20879904281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17979 + ... + 205141.

Almost surely, 2^20879904280 is an apocalyptic number.

20879904280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20879904280 is an abundant number, since it is smaller than the sum of its proper divisors (26116976120).

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

20879904280 is a wasteful number, since it uses less digits than its factorization.

20879904280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189963 (or 189959 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 49.

The spelling of 20879904280 in words is "twenty billion, eight hundred seventy-nine million, nine hundred four thousand, two hundred eighty".