19996018 has 24 divisors (see below), whose sum is σ = 36730800. Its totient is φ = 8117928.

The previous prime is 19996013. The next prime is 19996019. The reversal of 19996018 is 81069991.

It is not an unprimeable number, because it can be changed into a prime (19996013) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3508 + ... + 7231.

It is an arithmetic number, because the mean of its divisors is an integer number (1530450).

Almost surely, 2^19996018 is an apocalyptic number.

19996018 is a deficient number, since it is larger than the sum of its proper divisors (16734782).

19996018 is a wasteful number, since it uses less digits than its factorization.

19996018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10774 (or 10767 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 43.

The square root of 19996018 is about 4471.6907317032. The cubic root of 19996018 is about 271.4237457789.

The spelling of 19996018 in words is "nineteen million, nine hundred ninety-six thousand, eighteen".