20839944 has 16 divisors (see below), whose sum is σ = 52099920. Its totient is φ = 6946640.

The previous prime is 20839939. The next prime is 20839957. The reversal of 20839944 is 44993802.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 434142 + ... + 434189.

It is an arithmetic number, because the mean of its divisors is an integer number (3256245).

Almost surely, 2^20839944 is an apocalyptic number.

20839944 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20839944 is an abundant number, since it is smaller than the sum of its proper divisors (31259976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20839944 is a wasteful number, since it uses less digits than its factorization.

20839944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868340 (or 868336 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 20839944 is about 4565.0787506898. The cubic root of 20839944 is about 275.1897049173.

The spelling of 20839944 in words is "twenty million, eight hundred thirty-nine thousand, nine hundred forty-four".