20039931 has 6 divisors (see below), whose sum is σ = 28946580. Its totient is φ = 13359948.

The previous prime is 20039893. The next prime is 20039933. The reversal of 20039931 is 13993002.

It is not a de Polignac number, because 20039931 - 2⁶ = 20039867 is a prime.

It is a super-2 number, since 2×20039931² = 803197668969522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20039895 and 20039904.

It is not an unprimeable number, because it can be changed into a prime (20039933) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1113321 + ... + 1113338.

It is an arithmetic number, because the mean of its divisors is an integer number (4824430).

Almost surely, 2^20039931 is an apocalyptic number.

20039931 is a deficient number, since it is larger than the sum of its proper divisors (8906649).

20039931 is a wasteful number, since it uses less digits than its factorization.

20039931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2226665 (or 2226662 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 27.

The square root of 20039931 is about 4476.5981503816. The cubic root of 20039931 is about 271.6222905841.

The spelling of 20039931 in words is "twenty million, thirty-nine thousand, nine hundred thirty-one".