20666024 has 8 divisors (see below), whose sum is σ = 38748810. Its totient is φ = 10333008.

The previous prime is 20666021. The next prime is 20666047. The reversal of 20666024 is 42066602.

It can be written as a sum of positive squares in only one way, i.e., 19201924 + 1464100 = 4382^2 + 1210^2 .

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 = 20665984 and 20666002.

It is not an unprimeable number, because it can be changed into a prime (20666021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1291619 + ... + 1291634.

Almost surely, 2^20666024 is an apocalyptic number.

It is an amenable number.

20666024 is a deficient number, since it is larger than the sum of its proper divisors (18082786).

20666024 is a wasteful number, since it uses less digits than its factorization.

20666024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2583259 (or 2583255 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 20666024 is about 4545.9898812030. The cubic root of 20666024 is about 274.4220324173.

The spelling of 20666024 in words is "twenty million, six hundred sixty-six thousand, twenty-four".