19998203400 has 960 divisors, whose sum is σ = 83722320000. Its totient is φ = 4419878400.

The previous prime is 19998203389. The next prime is 19998203417. The reversal of 19998203400 is 430289991.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 327839370 + ... + 327839430.

It is an arithmetic number, because the mean of its divisors is an integer number (87210750).

Almost surely, 2^19998203400 is an apocalyptic number.

19998203400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19998203400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41861160000).

19998203400 is an abundant number, since it is smaller than the sum of its proper divisors (63724116600).

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

19998203400 is a wasteful number, since it uses less digits than its factorization.

19998203400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The spelling of 19998203400 in words is "nineteen billion, nine hundred ninety-eight million, two hundred three thousand, four hundred".