18420326840 has 16 divisors (see below), whose sum is σ = 41445735480. Its totient is φ = 7368130720.

The previous prime is 18420326819. The next prime is 18420326857. The reversal of 18420326840 is 4862302481.

It is a junction number, because it is equal to n+sod(n) for n = 18420326794 and 18420326803.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230254046 + ... + 230254125.

Almost surely, 2^18420326840 is an apocalyptic number.

18420326840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18420326840 is an abundant number, since it is smaller than the sum of its proper divisors (23025408640).

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

18420326840 is a wasteful number, since it uses less digits than its factorization.

18420326840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460508182 (or 460508178 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 38.

The spelling of 18420326840 in words is "eighteen billion, four hundred twenty million, three hundred twenty-six thousand, eight hundred forty".