19803963816 has 384 divisors, whose sum is σ = 72318355200. Its totient is φ = 4745502720.

The previous prime is 19803963811. The next prime is 19803963827. The reversal of 19803963816 is 61836930891.

It is not an unprimeable number, because it can be changed into a prime (19803963811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3227071 + ... + 3233201.

It is an arithmetic number, because the mean of its divisors is an integer number (188329050).

Almost surely, 2^19803963816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19803963816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36159177600).

19803963816 is an abundant number, since it is smaller than the sum of its proper divisors (52514391384).

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

19803963816 is a wasteful number, since it uses less digits than its factorization.

19803963816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6209 (or 6202 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 54.

The spelling of 19803963816 in words is "nineteen billion, eight hundred three million, nine hundred sixty-three thousand, eight hundred sixteen".