19899729120 has 96 divisors (see below), whose sum is σ = 62703728640. Its totient is φ = 5304936960.

The previous prime is 19899728999. The next prime is 19899729133. The reversal of 19899729120 is 2192799891.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2776101 + ... + 2783259.

It is an arithmetic number, because the mean of its divisors is an integer number (653163840).

Almost surely, 2^19899729120 is an apocalyptic number.

19899729120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19899729120 is an abundant number, since it is smaller than the sum of its proper divisors (42803999520).

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

19899729120 is a wasteful number, since it uses less digits than its factorization.

19899729120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12968 (or 12960 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 57.

The spelling of 19899729120 in words is "nineteen billion, eight hundred ninety-nine million, seven hundred twenty-nine thousand, one hundred twenty".