19944666 has 36 divisors (see below), whose sum is σ = 50270922. Its totient is φ = 5698224.

The previous prime is 19944649. The next prime is 19944667. The reversal of 19944666 is 66644991.

It can be written as a sum of positive squares in only one way, i.e., 17464041 + 2480625 = 4179^2 + 1575^2 .

It is not an unprimeable number, because it can be changed into a prime (19944667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 10425 + ... + 12188.

Almost surely, 2^19944666 is an apocalyptic number.

19944666 is an abundant number, since it is smaller than the sum of its proper divisors (30326256).

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

19944666 is a wasteful number, since it uses less digits than its factorization.

19944666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22635 (or 22625 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 19944666 is about 4465.9451407289. The cubic root of 19944666 is about 271.1911977982.

The spelling of 19944666 in words is "nineteen million, nine hundred forty-four thousand, six hundred sixty-six".