18326420 has 48 divisors (see below), whose sum is σ = 44567040. Its totient is φ = 6200064.

The previous prime is 18326419. The next prime is 18326437. The reversal of 18326420 is 2462381.

It is a self number, because there is not a number n which added to its sum of digits gives 18326420.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10232 + ... + 11888.

It is an arithmetic number, because the mean of its divisors is an integer number (928480).

Almost surely, 2^18326420 is an apocalyptic number.

18326420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18326420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22283520).

18326420 is an abundant number, since it is smaller than the sum of its proper divisors (26240620).

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

18326420 is a wasteful number, since it uses less digits than its factorization.

18326420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1752 (or 1750 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 18326420 is about 4280.9368133622. The cubic root of 18326420 is about 263.6488482539.

The spelling of 18326420 in words is "eighteen million, three hundred twenty-six thousand, four hundred twenty".