19966768 has 10 divisors (see below), whose sum is σ = 38685644. Its totient is φ = 9983376.

The previous prime is 19966763. The next prime is 19966769. The reversal of 19966768 is 86766991.

It is not an unprimeable number, because it can be changed into a prime (19966763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623946 + ... + 623977.

Almost surely, 2^19966768 is an apocalyptic number.

It is an amenable number.

19966768 is a deficient number, since it is larger than the sum of its proper divisors (18718876).

19966768 is a wasteful number, since it uses less digits than its factorization.

19966768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1247931 (or 1247925 counting only the distinct ones).

The product of its digits is 979776, while the sum is 52.

The square root of 19966768 is about 4468.4189597664. The cubic root of 19966768 is about 271.2913357691.

The spelling of 19966768 in words is "nineteen million, nine hundred sixty-six thousand, seven hundred sixty-eight".