18209111420 has 48 divisors (see below), whose sum is σ = 39200021280. Its totient is φ = 7102308096.

The previous prime is 18209111419. The next prime is 18209111423. The reversal of 18209111420 is 2411190281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18209111423) 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, 120086 + ... + 225474.

It is an arithmetic number, because the mean of its divisors is an integer number (816667110).

Almost surely, 2^18209111420 is an apocalyptic number.

18209111420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18209111420 is an abundant number, since it is smaller than the sum of its proper divisors (20990909860).

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

18209111420 is a wasteful number, since it uses less digits than its factorization.

18209111420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105614 (or 105612 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 29.

The spelling of 18209111420 in words is "eighteen billion, two hundred nine million, one hundred eleven thousand, four hundred twenty".