19729798800 has 180 divisors, whose sum is σ = 67138704336. Its totient is φ = 4951705600.

The previous prime is 19729798763. The next prime is 19729798849. The reversal of 19729798800 is 889792791.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 318355 + ... + 375245.

Almost surely, 2^19729798800 is an apocalyptic number.

19729798800 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 19729798800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33569352168).

19729798800 is an abundant number, since it is smaller than the sum of its proper divisors (47408905536).

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

19729798800 is a wasteful number, since it uses less digits than its factorization.

19729798800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56946 (or 56918 counting only the distinct ones).

The product of its (nonzero) digits is 4572288, while the sum is 60.

The spelling of 19729798800 in words is "nineteen billion, seven hundred twenty-nine million, seven hundred ninety-eight thousand, eight hundred".