19944630720 has 504 divisors, whose sum is σ = 80856734400. Its totient is φ = 4498550784.

The previous prime is 19944630679. The next prime is 19944630731. The reversal of 19944630720 is 2703644991.

It is a happy number.

19944630720 is a `hidden beast` number, since 1 + 9 + 9 + 4 + 4 + 630 + 7 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (504).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 11147586 + ... + 11149374.

Almost surely, 2^19944630720 is an apocalyptic number.

19944630720 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 19944630720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40428367200).

19944630720 is an abundant number, since it is smaller than the sum of its proper divisors (60912103680).

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

19944630720 is a wasteful number, since it uses less digits than its factorization.

19944630720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1905 (or 1885 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The spelling of 19944630720 in words is "nineteen billion, nine hundred forty-four million, six hundred thirty thousand, seven hundred twenty".