20279679 has 12 divisors (see below), whose sum is σ = 31454424. Its totient is φ = 11588304.

The previous prime is 20279653. The next prime is 20279681. The reversal of 20279679 is 97697202.

It is not a de Polignac number, because 20279679 - 2⁵ = 20279647 is a prime.

It is a super-2 number, since 2×20279679² = 822530760686082, which contains 22 as substring.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 20279679.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20279179) 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, 68832 + ... + 69125.

It is an arithmetic number, because the mean of its divisors is an integer number (2621202).

Almost surely, 2^20279679 is an apocalyptic number.

20279679 is a deficient number, since it is larger than the sum of its proper divisors (11174745).

20279679 is a wasteful number, since it uses less digits than its factorization.

20279679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137974 (or 137967 counting only the distinct ones).

The product of its (nonzero) digits is 95256, while the sum is 42.

The square root of 20279679 is about 4503.2964592618. The cubic root of 20279679 is about 272.7011852118.

The spelling of 20279679 in words is "twenty million, two hundred seventy-nine thousand, six hundred seventy-nine".