19100919920 has 40 divisors (see below), whose sum is σ = 45442429296. Its totient is φ = 7462683648.

The previous prime is 19100919883. The next prime is 19100919931. The reversal of 19100919920 is 2991900191.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2772857 + ... + 2779736.

Almost surely, 2^19100919920 is an apocalyptic number.

19100919920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19100919920 is an abundant number, since it is smaller than the sum of its proper divisors (26341509376).

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

19100919920 is a wasteful number, since it uses less digits than its factorization.

19100919920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5552649 (or 5552643 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 41.

The spelling of 19100919920 in words is "nineteen billion, one hundred million, nine hundred nineteen thousand, nine hundred twenty".