20570979 has 16 divisors (see below), whose sum is σ = 32223744. Its totient is φ = 11508000.

The previous prime is 20570959. The next prime is 20570989. The reversal of 20570979 is 97907502.

It is not a de Polignac number, because 20570979 - 2⁸ = 20570723 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (20570909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23547 + ... + 24404.

It is an arithmetic number, because the mean of its divisors is an integer number (2013984).

Almost surely, 2^20570979 is an apocalyptic number.

20570979 is a deficient number, since it is larger than the sum of its proper divisors (11652765).

20570979 is a wasteful number, since it uses less digits than its factorization.

20570979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47978.

The product of its (nonzero) digits is 39690, while the sum is 39.

The square root of 20570979 is about 4535.5241152484. The cubic root of 20570979 is about 274.0006881898. Note that the first 3 decimals are identical.

The spelling of 20570979 in words is "twenty million, five hundred seventy thousand, nine hundred seventy-nine".