19903820608 has 28 divisors (see below), whose sum is σ = 45139022752. Its totient is φ = 8530208640.

The previous prime is 19903820603. The next prime is 19903820611. The reversal of 19903820608 is 80602830991.

It is a tau number, because it is divible by the number of its divisors (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19903820603) 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 3 ways as a sum of consecutive naturals, for example, 22213638 + ... + 22214533.

Almost surely, 2^19903820608 is an apocalyptic number.

It is an amenable number.

19903820608 is an abundant number, since it is smaller than the sum of its proper divisors (25235202144).

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

19903820608 is an equidigital number, since it uses as much as digits as its factorization.

19903820608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44428190 (or 44428180 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 46.

The spelling of 19903820608 in words is "nineteen billion, nine hundred three million, eight hundred twenty thousand, six hundred eight".