19998824 has 8 divisors (see below), whose sum is σ = 37497810. Its totient is φ = 9999408.

The previous prime is 19998809. The next prime is 19998841. The reversal of 19998824 is 42889991.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18748900 + 1249924 = 4330^2 + 1118^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×19998824² = 799905922765952, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1249919 + ... + 1249934.

Almost surely, 2^19998824 is an apocalyptic number.

It is an amenable number.

19998824 is a deficient number, since it is larger than the sum of its proper divisors (17498986).

19998824 is a wasteful number, since it uses less digits than its factorization.

19998824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2499859 (or 2499855 counting only the distinct ones).

The product of its digits is 373248, while the sum is 50.

The square root of 19998824 is about 4472.0044722697. The cubic root of 19998824 is about 271.4364412967.

The spelling of 19998824 in words is "nineteen million, nine hundred ninety-eight thousand, eight hundred twenty-four".