20279264138 has 16 divisors (see below), whose sum is σ = 34781144640. Its totient is φ = 8686940256.

The previous prime is 20279264111. The next prime is 20279264153. The reversal of 20279264138 is 83146297202.

It is a super-2 number, since 2×20279264138² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 317456 + ... + 375947.

It is an arithmetic number, because the mean of its divisors is an integer number (2173821540).

Almost surely, 2^20279264138 is an apocalyptic number.

20279264138 is a deficient number, since it is larger than the sum of its proper divisors (14501880502).

20279264138 is a wasteful number, since it uses less digits than its factorization.

20279264138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695501.

The product of its (nonzero) digits is 290304, while the sum is 44.

The spelling of 20279264138 in words is "twenty billion, two hundred seventy-nine million, two hundred sixty-four thousand, one hundred thirty-eight".