19668988 has 12 divisors (see below), whose sum is σ = 34906032. Its totient is φ = 9695840.

The previous prime is 19668977. The next prime is 19668997. The reversal of 19668988 is 88986691.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34345 + ... + 34912.

It is an arithmetic number, because the mean of its divisors is an integer number (2908836).

Almost surely, 2^19668988 is an apocalyptic number.

It is an amenable number.

19668988 is a deficient number, since it is larger than the sum of its proper divisors (15237044).

19668988 is a wasteful number, since it uses less digits than its factorization.

19668988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69332 (or 69330 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 55.

The square root of 19668988 is about 4434.9732806410. The cubic root of 19668988 is about 269.9359152890.

The spelling of 19668988 in words is "nineteen million, six hundred sixty-eight thousand, nine hundred eighty-eight".