20684704 has 12 divisors (see below), whose sum is σ = 40723074. Its totient is φ = 10342336.

The previous prime is 20684693. The next prime is 20684717. The reversal of 20684704 is 40748602.

It can be written as a sum of positive squares in only one way, i.e., 20684304 + 400 = 4548^2 + 20^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323167 + ... + 323230.

Almost surely, 2^20684704 is an apocalyptic number.

It is an amenable number.

20684704 is a deficient number, since it is larger than the sum of its proper divisors (20038370).

20684704 is an equidigital number, since it uses as much as digits as its factorization.

20684704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646407 (or 646399 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 20684704 is about 4548.0439751612. The cubic root of 20684704 is about 274.5046907912.

The spelling of 20684704 in words is "twenty million, six hundred eighty-four thousand, seven hundred four".