19982666 has 24 divisors (see below), whose sum is σ = 33439392. Its totient is φ = 8947400.

The previous prime is 19982657. The next prime is 19982671. The reversal of 19982666 is 66628991.

It is a self number, because there is not a number n which added to its sum of digits gives 19982666.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 16601 + ... + 17763.

It is an arithmetic number, because the mean of its divisors is an integer number (1393308).

Almost surely, 2^19982666 is an apocalyptic number.

19982666 is a deficient number, since it is larger than the sum of its proper divisors (13456726).

19982666 is a wasteful number, since it uses less digits than its factorization.

19982666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1258 (or 1247 counting only the distinct ones).

The product of its digits is 279936, while the sum is 47.

The square root of 19982666 is about 4470.1975347852. The cubic root of 19982666 is about 271.3633194682.

It can be divided in two parts, 1998 and 2666, that added together give a palindrome (4664).

The spelling of 19982666 in words is "nineteen million, nine hundred eighty-two thousand, six hundred sixty-six".