19998884 has 12 divisors (see below), whose sum is σ = 35319900. Its totient is φ = 9907488.

The previous prime is 19998877. The next prime is 19998899. The reversal of 19998884 is 48889991.

It can be written as a sum of positive squares in 2 ways, for example, as 13897984 + 6100900 = 3728^2 + 2470^2 .

It is a super-2 number, since 2×19998884² = 799910722490912, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22499 + ... + 23370.

It is an arithmetic number, because the mean of its divisors is an integer number (2943325).

Almost surely, 2^19998884 is an apocalyptic number.

It is an amenable number.

19998884 is a deficient number, since it is larger than the sum of its proper divisors (15321016).

19998884 is a wasteful number, since it uses less digits than its factorization.

19998884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45982 (or 45980 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 56.

The square root of 19998884 is about 4472.0111806658. The cubic root of 19998884 is about 271.4367127488.

The spelling of 19998884 in words is "nineteen million, nine hundred ninety-eight thousand, eight hundred eighty-four".