20928684 has 36 divisors (see below), whose sum is σ = 56808024. Its totient is φ = 5979456.

The previous prime is 20928679. The next prime is 20928703. The reversal of 20928684 is 48682902.

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, 17209 + ... + 18384.

Almost surely, 2^20928684 is an apocalyptic number.

It is an amenable number.

20928684 is an abundant number, since it is smaller than the sum of its proper divisors (35879340).

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

20928684 is a wasteful number, since it uses less digits than its factorization.

20928684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35614 (or 35605 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 20928684 is about 4574.7878639342. The cubic root of 20928684 is about 275.5797532177.

It can be divided in two parts, 20928 and 684, that added together give a palindrome (21612).

The spelling of 20928684 in words is "twenty million, nine hundred twenty-eight thousand, six hundred eighty-four".