20139684 has 24 divisors (see below), whose sum is σ = 47097120. Its totient is φ = 6698304.

The previous prime is 20139683. The next prime is 20139737. The reversal of 20139684 is 48693102.

It is not an unprimeable number, because it can be changed into a prime (20139683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4672 + ... + 7880.

It is an arithmetic number, because the mean of its divisors is an integer number (1962380).

Almost surely, 2^20139684 is an apocalyptic number.

It is an amenable number.

20139684 is an abundant number, since it is smaller than the sum of its proper divisors (26957436).

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

20139684 is a wasteful number, since it uses less digits than its factorization.

20139684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3739 (or 3737 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 20139684 is about 4487.7259274604. The cubic root of 20139684 is about 272.0722306730.

The spelling of 20139684 in words is "twenty million, one hundred thirty-nine thousand, six hundred eighty-four".