19998013 has 16 divisors (see below), whose sum is σ = 24520320. Its totient is φ = 15926976.

The previous prime is 19997993. The next prime is 19998029. The reversal of 19998013 is 31089991.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19998013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19998413) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5631 + ... + 8467.

It is an arithmetic number, because the mean of its divisors is an integer number (1532520).

Almost surely, 2^19998013 is an apocalyptic number.

It is an amenable number.

19998013 is a deficient number, since it is larger than the sum of its proper divisors (4522307).

19998013 is a wasteful number, since it uses less digits than its factorization.

19998013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2916.

The product of its (nonzero) digits is 17496, while the sum is 40.

The square root of 19998013 is about 4471.9137961280. The cubic root of 19998013 is about 271.4327721154.

The spelling of 19998013 in words is "nineteen million, nine hundred ninety-eight thousand, thirteen".