19968866 has 8 divisors (see below), whose sum is σ = 29972700. Its totient is φ = 9977968.

The previous prime is 19968827. The next prime is 19968869. The reversal of 19968866 is 66886991.

It can be written as a sum of positive squares in 2 ways, for example, as 16638241 + 3330625 = 4079^2 + 1825^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (19968869) 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 3 ways as a sum of consecutive naturals, for example, 3140 + ... + 7056.

Almost surely, 2^19968866 is an apocalyptic number.

19968866 is a deficient number, since it is larger than the sum of its proper divisors (10003834).

19968866 is a wasteful number, since it uses less digits than its factorization.

19968866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6468.

The product of its digits is 1119744, while the sum is 53.

The square root of 19968866 is about 4468.6537122494. The cubic root of 19968866 is about 271.3008373784.

The spelling of 19968866 in words is "nineteen million, nine hundred sixty-eight thousand, eight hundred sixty-six".