19965916 has 6 divisors (see below), whose sum is σ = 34940360. Its totient is φ = 9982956.

The previous prime is 19965887. The next prime is 19965917. The reversal of 19965916 is 61956991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19965917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2495736 + ... + 2495743.

Almost surely, 2^19965916 is an apocalyptic number.

It is an amenable number.

19965916 is a deficient number, since it is larger than the sum of its proper divisors (14974444).

19965916 is a wasteful number, since it uses less digits than its factorization.

19965916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4991483 (or 4991481 counting only the distinct ones).

The product of its digits is 131220, while the sum is 46.

The square root of 19965916 is about 4468.3236230157. The cubic root of 19965916 is about 271.2874769655.

The spelling of 19965916 in words is "nineteen million, nine hundred sixty-five thousand, nine hundred sixteen".