19966694 has 12 divisors (see below), whose sum is σ = 32920692. Its totient is φ = 9075660.

The previous prime is 19966679. The next prime is 19966699. The reversal of 19966694 is 49666991.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19966699) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 41012 + ... + 41495.

It is an arithmetic number, because the mean of its divisors is an integer number (2743391).

Almost surely, 2^19966694 is an apocalyptic number.

19966694 is a deficient number, since it is larger than the sum of its proper divisors (12953998).

19966694 is a wasteful number, since it uses less digits than its factorization.

19966694 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82531 (or 82520 counting only the distinct ones).

The product of its digits is 629856, while the sum is 50.

The square root of 19966694 is about 4468.4106794251. The cubic root of 19966694 is about 271.2910006191.

The spelling of 19966694 in words is "nineteen million, nine hundred sixty-six thousand, six hundred ninety-four".