19995966 has 12 divisors (see below), whose sum is σ = 43324632. Its totient is φ = 6665316.

The previous prime is 19995959. The next prime is 19995967. The reversal of 19995966 is 66959991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19995967) 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 in 5 ways as a sum of consecutive naturals, for example, 555426 + ... + 555461.

It is an arithmetic number, because the mean of its divisors is an integer number (3610386).

Almost surely, 2^19995966 is an apocalyptic number.

19995966 is an abundant number, since it is smaller than the sum of its proper divisors (23328666).

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

19995966 is a wasteful number, since it uses less digits than its factorization.

19995966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1110895 (or 1110892 counting only the distinct ones).

The product of its digits is 1180980, while the sum is 54.

The square root of 19995966 is about 4471.6849173438. The cubic root of 19995966 is about 271.4235104979.

The spelling of 19995966 in words is "nineteen million, nine hundred ninety-five thousand, nine hundred sixty-six".