20664232 has 8 divisors (see below), whose sum is σ = 38745450. Its totient is φ = 10332112.

The previous prime is 20664139. The next prime is 20664239. The reversal of 20664232 is 23246602.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 14243076 + 6421156 = 3774^2 + 2534^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 20664197 and 20664206.

It is not an unprimeable number, because it can be changed into a prime (20664239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1291507 + ... + 1291522.

Almost surely, 2^20664232 is an apocalyptic number.

It is an amenable number.

20664232 is a deficient number, since it is larger than the sum of its proper divisors (18081218).

20664232 is a wasteful number, since it uses less digits than its factorization.

20664232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2583035 (or 2583031 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 20664232 is about 4545.7927801430. The cubic root of 20664232 is about 274.4141002594.

The spelling of 20664232 in words is "twenty million, six hundred sixty-four thousand, two hundred thirty-two".