20331684 has 36 divisors (see below), whose sum is σ = 51810304. Its totient is φ = 6722352.

The previous prime is 20331679. The next prime is 20331721. The reversal of 20331684 is 48613302.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

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, 2349 + ... + 6795.

Almost surely, 2^20331684 is an apocalyptic number.

It is an amenable number.

20331684 is an abundant number, since it is smaller than the sum of its proper divisors (31478620).

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

20331684 is a wasteful number, since it uses less digits than its factorization.

20331684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4584 (or 4579 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 20331684 is about 4509.0668657717. The cubic root of 20331684 is about 272.9340902757.

Adding to 20331684 its reverse (48613302), we get a palindrome (68944986).

The spelling of 20331684 in words is "twenty million, three hundred thirty-one thousand, six hundred eighty-four".