18920841329 has 6 divisors (see below), whose sum is σ = 20488248486. Its totient is φ = 17465391840.

The previous prime is 18920841319. The next prime is 18920841349. The reversal of 18920841329 is 92314802981.

It can be written as a sum of positive squares in 3 ways, for example, as 2240602225 + 16680239104 = 47335^2 + 129152^2 .

It is not a de Polignac number, because 18920841329 - 2²⁸ = 18652405873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18920841319) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55978652 + ... + 55978989.

It is an arithmetic number, because the mean of its divisors is an integer number (3414708081).

Almost surely, 2^18920841329 is an apocalyptic number.

It is an amenable number.

18920841329 is a deficient number, since it is larger than the sum of its proper divisors (1567407157).

18920841329 is a wasteful number, since it uses less digits than its factorization.

18920841329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111957667 (or 111957654 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 47.

The spelling of 18920841329 in words is "eighteen billion, nine hundred twenty million, eight hundred forty-one thousand, three hundred twenty-nine".