20139624 has 32 divisors (see below), whose sum is σ = 55944000. Its totient is φ = 6713136.

The previous prime is 20139619. The next prime is 20139643. The reversal of 20139624 is 42693102.

20139624 is a `hidden beast` number, since 2 + 0 + 1 + 39 + 624 = 666.

It is a super-2 number, since 2×20139624² = 811208909722752, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46404 + ... + 46835.

It is an arithmetic number, because the mean of its divisors is an integer number (1748250).

Almost surely, 2^20139624 is an apocalyptic number.

20139624 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20139624 is an abundant number, since it is smaller than the sum of its proper divisors (35804376).

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

20139624 is a wasteful number, since it uses less digits than its factorization.

20139624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93254 (or 93244 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 20139624 is about 4487.7192425552. The cubic root of 20139624 is about 272.0719604875.

The spelling of 20139624 in words is "twenty million, one hundred thirty-nine thousand, six hundred twenty-four".