20879257239 has 12 divisors (see below), whose sum is σ = 31470185136. Its totient is φ = 13314308832.

The previous prime is 20879257229. The next prime is 20879257241. The reversal of 20879257239 is 93275297802.

It is a de Polignac number, because none of the positive numbers 2^k-20879257239 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20879257229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50432782 + ... + 50433195.

It is an arithmetic number, because the mean of its divisors is an integer number (2622515428).

Almost surely, 2^20879257239 is an apocalyptic number.

20879257239 is a deficient number, since it is larger than the sum of its proper divisors (10590927897).

20879257239 is a wasteful number, since it uses less digits than its factorization.

20879257239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100866006 (or 100866003 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 54.

The spelling of 20879257239 in words is "twenty billion, eight hundred seventy-nine million, two hundred fifty-seven thousand, two hundred thirty-nine".