20792139 has 16 divisors (see below), whose sum is σ = 29459232. Its totient is φ = 12999168.

The previous prime is 20792119. The next prime is 20792143. The reversal of 20792139 is 93129702.

It is not a de Polignac number, because 20792139 - 2⁹ = 20791627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20792119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18477 + ... + 19569.

It is an arithmetic number, because the mean of its divisors is an integer number (1841202).

Almost surely, 2^20792139 is an apocalyptic number.

20792139 is a deficient number, since it is larger than the sum of its proper divisors (8667093).

20792139 is a wasteful number, since it uses less digits than its factorization.

20792139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1486.

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 20792139 is about 4559.8397998175. The cubic root of 20792139 is about 274.9791234841.

The spelling of 20792139 in words is "twenty million, seven hundred ninety-two thousand, one hundred thirty-nine".