20939438 has 24 divisors (see below), whose sum is σ = 34863696. Its totient is φ = 9422400.

The previous prime is 20939419. The next prime is 20939459. The reversal of 20939438 is 83493902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13103 + ... + 14613.

It is an arithmetic number, because the mean of its divisors is an integer number (1452654).

Almost surely, 2^20939438 is an apocalyptic number.

20939438 is a deficient number, since it is larger than the sum of its proper divisors (13924258).

20939438 is a wasteful number, since it uses less digits than its factorization.

20939438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580 (or 1567 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 20939438 is about 4575.9630680328. The cubic root of 20939438 is about 275.6269464575.

The spelling of 20939438 in words is "twenty million, nine hundred thirty-nine thousand, four hundred thirty-eight".