19998700 has 36 divisors (see below), whose sum is σ = 43637832. Its totient is φ = 7955200.

The previous prime is 19998691. The next prime is 19998701. The reversal of 19998700 is 789991.

It is not an unprimeable number, because it can be changed into a prime (19998701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22260 + ... + 23140.

It is an arithmetic number, because the mean of its divisors is an integer number (1212162).

Almost surely, 2^19998700 is an apocalyptic number.

19998700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19998700 is an abundant number, since it is smaller than the sum of its proper divisors (23639132).

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

19998700 is a wasteful number, since it uses less digits than its factorization.

19998700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122 (or 1115 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 43.

The square root of 19998700 is about 4471.9906082191. The cubic root of 19998700 is about 271.4358802939.

The spelling of 19998700 in words is "nineteen million, nine hundred ninety-eight thousand, seven hundred".