19992953800 has 96 divisors (see below), whose sum is σ = 48434400000. Its totient is φ = 7665557760.

The previous prime is 19992953797. The next prime is 19992953837. The reversal of 19992953800 is 835929991.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 793801 + ... + 818599.

It is an arithmetic number, because the mean of its divisors is an integer number (504525000).

Almost surely, 2^19992953800 is an apocalyptic number.

19992953800 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 19992953800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24217200000).

19992953800 is an abundant number, since it is smaller than the sum of its proper divisors (28441446200).

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

19992953800 is a wasteful number, since it uses less digits than its factorization.

19992953800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24983 (or 24974 counting only the distinct ones).

The product of its (nonzero) digits is 1574640, while the sum is 55.

The spelling of 19992953800 in words is "nineteen billion, nine hundred ninety-two million, nine hundred fifty-three thousand, eight hundred".