19998744 has 16 divisors (see below), whose sum is σ = 49996920. Its totient is φ = 6666240.

The previous prime is 19998743. The next prime is 19998757. The reversal of 19998744 is 44789991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19998743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 416617 + ... + 416664.

Almost surely, 2^19998744 is an apocalyptic number.

It is an amenable number.

19998744 is an abundant number, since it is smaller than the sum of its proper divisors (29998176).

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

19998744 is a wasteful number, since it uses less digits than its factorization.

19998744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833290 (or 833286 counting only the distinct ones).

The product of its digits is 653184, while the sum is 51.

The square root of 19998744 is about 4471.9955277258. The cubic root of 19998744 is about 271.4360793597.

The spelling of 19998744 in words is "nineteen million, nine hundred ninety-eight thousand, seven hundred forty-four".