19666012 has 24 divisors (see below), whose sum is σ = 36140832. Its totient is φ = 9345600.

The previous prime is 19665967. The next prime is 19666027. The reversal of 19666012 is 21066691.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16062 + ... + 17242.

It is an arithmetic number, because the mean of its divisors is an integer number (1505868).

Almost surely, 2^19666012 is an apocalyptic number.

It is an amenable number.

19666012 is a deficient number, since it is larger than the sum of its proper divisors (16474820).

19666012 is a wasteful number, since it uses less digits than its factorization.

19666012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1389 (or 1387 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 19666012 is about 4434.6377529625. The cubic root of 19666012 is about 269.9223004587.

The spelling of 19666012 in words is "nineteen million, six hundred sixty-six thousand, twelve".