19998844 has 12 divisors (see below), whose sum is σ = 36127168. Its totient is φ = 9676800.

The previous prime is 19998841. The next prime is 19998859. The reversal of 19998844 is 44889991.

It is a happy number.

It is a super-2 number, since 2×19998844² = 799907522672672, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19998791 and 19998800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19998841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80517 + ... + 80764.

Almost surely, 2^19998844 is an apocalyptic number.

It is an amenable number.

19998844 is a deficient number, since it is larger than the sum of its proper divisors (16128324).

19998844 is a wasteful number, since it uses less digits than its factorization.

19998844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161316 (or 161314 counting only the distinct ones).

The product of its digits is 746496, while the sum is 52.

The square root of 19998844 is about 4472.0067084028. The cubic root of 19998844 is about 271.4365317808.

The spelling of 19998844 in words is "nineteen million, nine hundred ninety-eight thousand, eight hundred forty-four".