19999600000 has 96 divisors (see below), whose sum is σ = 49801500000. Its totient is φ = 7999680000.

The previous prime is 19999599967. The next prime is 19999600007. The reversal of 19999600000 is 699991.

It is a self number, because there is not a number n which added to its sum of digits gives 19999600000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19999600007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 375001 + ... + 424999.

It is an arithmetic number, because the mean of its divisors is an integer number (518765625).

Almost surely, 2^19999600000 is an apocalyptic number.

19999600000 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 19999600000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24900750000).

19999600000 is an abundant number, since it is smaller than the sum of its proper divisors (29801900000).

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

19999600000 is an frugal number, since it uses more digits than its factorization.

19999600000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50038 (or 50006 counting only the distinct ones).

The product of its (nonzero) digits is 39366, while the sum is 43.

The spelling of 19999600000 in words is "nineteen billion, nine hundred ninety-nine million, six hundred thousand".