18920813193 has 16 divisors (see below), whose sum is σ = 28187438400. Its totient is φ = 12543403680.

The previous prime is 18920813167. The next prime is 18920813201. The reversal of 18920813193 is 39131802981.

It is not a de Polignac number, because 18920813193 - 2³⁰ = 17847071369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18920813123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1952628 + ... + 1962293.

It is an arithmetic number, because the mean of its divisors is an integer number (1761714900).

Almost surely, 2^18920813193 is an apocalyptic number.

It is an amenable number.

18920813193 is a deficient number, since it is larger than the sum of its proper divisors (9266625207).

18920813193 is a wasteful number, since it uses less digits than its factorization.

18920813193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3915109 (or 3915103 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 45.

The spelling of 18920813193 in words is "eighteen billion, nine hundred twenty million, eight hundred thirteen thousand, one hundred ninety-three".