19985908800 has 504 divisors, whose sum is σ = 77646710848. Its totient is φ = 4470681600.

The previous prime is 19985908799. The next prime is 19985908837. The reversal of 19985908800 is 880958991.

It is an unprimeable number.

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 71 ways as a sum of consecutive naturals, for example, 7549077 + ... + 7551723.

Almost surely, 2^19985908800 is an apocalyptic number.

19985908800 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 19985908800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38823355424).

19985908800 is an abundant number, since it is smaller than the sum of its proper divisors (57660802048).

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

19985908800 is a wasteful number, since it uses less digits than its factorization.

19985908800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2707 (or 2681 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 57.

The spelling of 19985908800 in words is "nineteen billion, nine hundred eighty-five million, nine hundred eight thousand, eight hundred".