20426879 has 4 divisors (see below), whose sum is σ = 22283880. Its totient is φ = 18569880.

The previous prime is 20426869. The next prime is 20426941. The reversal of 20426879 is 97862402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20426879 - 2⁴ = 20426863 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 (20426839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 928484 + ... + 928505.

It is an arithmetic number, because the mean of its divisors is an integer number (5570970).

Almost surely, 2^20426879 is an apocalyptic number.

20426879 is a deficient number, since it is larger than the sum of its proper divisors (1857001).

20426879 is a wasteful number, since it uses less digits than its factorization.

20426879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1857000.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 20426879 is about 4519.6104920668. The cubic root of 20426879 is about 273.3593955253.

The spelling of 20426879 in words is "twenty million, four hundred twenty-six thousand, eight hundred seventy-nine".