19992087808 has 108 divisors (see below), whose sum is σ = 50641833312. Its totient is φ = 7789071360.

The previous prime is 19992087781. The next prime is 19992087827. The reversal of 19992087808 is 80878029991.

It is a super-3 number, since 3×19992087808³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65541 + ... + 210427.

It is an arithmetic number, because the mean of its divisors is an integer number (468905864).

Almost surely, 2^19992087808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19992087808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25320916656).

19992087808 is an abundant number, since it is smaller than the sum of its proper divisors (30649745504).

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

19992087808 is a wasteful number, since it uses less digits than its factorization.

19992087808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144928 (or 144907 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 61.

The spelling of 19992087808 in words is "nineteen billion, nine hundred ninety-two million, eighty-seven thousand, eight hundred eight".