20664244 has 6 divisors (see below), whose sum is σ = 36162434. Its totient is φ = 10332120.

The previous prime is 20664239. The next prime is 20664257. The reversal of 20664244 is 44246602.

It can be written as a sum of positive squares in only one way, i.e., 19536400 + 1127844 = 4420^2 + 1062^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2583027 + ... + 2583034.

Almost surely, 2^20664244 is an apocalyptic number.

It is an amenable number.

20664244 is a deficient number, since it is larger than the sum of its proper divisors (15498190).

20664244 is a wasteful number, since it uses less digits than its factorization.

20664244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5166065 (or 5166063 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

The square root of 20664244 is about 4545.7941000446. The cubic root of 20664244 is about 274.4141533781.

The spelling of 20664244 in words is "twenty million, six hundred sixty-four thousand, two hundred forty-four".