19904798091 has 16 divisors (see below), whose sum is σ = 27771146240. Its totient is φ = 12665885760.

The previous prime is 19904798071. The next prime is 19904798093. The reversal of 19904798091 is 19089740991.

It is not a de Polignac number, because 19904798091 - 2¹⁰ = 19904797067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19904798093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1459171 + ... + 1472748.

It is an arithmetic number, because the mean of its divisors is an integer number (1735696640).

Almost surely, 2^19904798091 is an apocalyptic number.

19904798091 is a deficient number, since it is larger than the sum of its proper divisors (7866348149).

19904798091 is a wasteful number, since it uses less digits than its factorization.

19904798091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2932026.

The product of its (nonzero) digits is 1469664, while the sum is 57.

The spelling of 19904798091 in words is "nineteen billion, nine hundred four million, seven hundred ninety-eight thousand, ninety-one".