20664204 has 48 divisors (see below), whose sum is σ = 54034176. Its totient is φ = 6091200.

The previous prime is 20664139. The next prime is 20664239. The reversal of 20664204 is 40246602.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2769 + ... + 6999.

It is an arithmetic number, because the mean of its divisors is an integer number (1125712).

Almost surely, 2^20664204 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20664204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27017088).

20664204 is an abundant number, since it is smaller than the sum of its proper divisors (33369972).

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

20664204 is a wasteful number, since it uses less digits than its factorization.

20664204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4286 (or 4284 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 20664204 is about 4545.7897003711. The cubic root of 20664204 is about 274.4139763158.

The spelling of 20664204 in words is "twenty million, six hundred sixty-four thousand, two hundred four".