19966404 has 12 divisors (see below), whose sum is σ = 46588304. Its totient is φ = 6655464.

The previous prime is 19966403. The next prime is 19966411. The reversal of 19966404 is 40466991.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (19966403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 831922 + ... + 831945.

Almost surely, 2^19966404 is an apocalyptic number.

It is an amenable number.

19966404 is an abundant number, since it is smaller than the sum of its proper divisors (26621900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19966404 is a wasteful number, since it uses less digits than its factorization.

19966404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1663874 (or 1663872 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 19966404 is about 4468.3782292908. The cubic root of 19966404 is about 271.2896871857.

The spelling of 19966404 in words is "nineteen million, nine hundred sixty-six thousand, four hundred four".