19944319800 has 48 divisors (see below), whose sum is σ = 61827393240. Its totient is φ = 5318485120.

The previous prime is 19944319789. The next prime is 19944319807. The reversal of 19944319800 is 891344991.

It is a self number, because there is not a number n which added to its sum of digits gives 19944319800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19944319807) 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, 16619667 + ... + 16620866.

Almost surely, 2^19944319800 is an apocalyptic number.

19944319800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19944319800 is an abundant number, since it is smaller than the sum of its proper divisors (41883073440).

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

19944319800 is a wasteful number, since it uses less digits than its factorization.

19944319800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33240552 (or 33240543 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 48.

The spelling of 19944319800 in words is "nineteen billion, nine hundred forty-four million, three hundred nineteen thousand, eight hundred".