20680684 has 12 divisors (see below), whose sum is σ = 36226008. Its totient is φ = 10330400.

The previous prime is 20680651. The next prime is 20680697. The reversal of 20680684 is 48608602.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4179 + ... + 7669.

It is an arithmetic number, because the mean of its divisors is an integer number (3018834).

Almost surely, 2^20680684 is an apocalyptic number.

It is an amenable number.

20680684 is a deficient number, since it is larger than the sum of its proper divisors (15545324).

20680684 is a wasteful number, since it uses less digits than its factorization.

20680684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4976 (or 4974 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 20680684 is about 4547.6020054530. The cubic root of 20680684 is about 274.4869066297.

The spelling of 20680684 in words is "twenty million, six hundred eighty thousand, six hundred eighty-four".