20718844 has 12 divisors (see below), whose sum is σ = 36666000. Its totient is φ = 10242848.

The previous prime is 20718839. The next prime is 20718851. The reversal of 20718844 is 44881702.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 28744 + ... + 29455.

It is an arithmetic number, because the mean of its divisors is an integer number (3055500).

Almost surely, 2^20718844 is an apocalyptic number.

It is an amenable number.

20718844 is a deficient number, since it is larger than the sum of its proper divisors (15947156).

20718844 is a wasteful number, since it uses less digits than its factorization.

20718844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58292 (or 58290 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 34.

The square root of 20718844 is about 4551.7956896153. The cubic root of 20718844 is about 274.6556306507.

The spelling of 20718844 in words is "twenty million, seven hundred eighteen thousand, eight hundred forty-four".