18381858420 has 48 divisors (see below), whose sum is σ = 51563389248. Its totient is φ = 4892858880.

The previous prime is 18381858419. The next prime is 18381858431. The reversal of 18381858420 is 2485818381.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 18381858420.

It is a congruent number.

It is an unprimeable number.

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, 247221 + ... + 312860.

It is an arithmetic number, because the mean of its divisors is an integer number (1074237276).

Almost surely, 2^18381858420 is an apocalyptic number.

18381858420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18381858420 is an abundant number, since it is smaller than the sum of its proper divisors (33181530828).

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

18381858420 is a wasteful number, since it uses less digits than its factorization.

18381858420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560640 (or 560638 counting only the distinct ones).

The product of its (nonzero) digits is 491520, while the sum is 48.

The spelling of 18381858420 in words is "eighteen billion, three hundred eighty-one million, eight hundred fifty-eight thousand, four hundred twenty".