20664772 has 12 divisors (see below), whose sum is σ = 36933120. Its totient is φ = 10112456.

The previous prime is 20664737. The next prime is 20664781. The reversal of 20664772 is 27746602.

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, 54772 + ... + 55147.

It is an arithmetic number, because the mean of its divisors is an integer number (3077760).

Almost surely, 2^20664772 is an apocalyptic number.

It is an amenable number.

20664772 is a deficient number, since it is larger than the sum of its proper divisors (16268348).

20664772 is a wasteful number, since it uses less digits than its factorization.

20664772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109970 (or 109968 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 34.

The square root of 20664772 is about 4545.8521753352. The cubic root of 20664772 is about 274.4164905785.

The spelling of 20664772 in words is "twenty million, six hundred sixty-four thousand, seven hundred seventy-two".