18354420 has 108 divisors (see below), whose sum is σ = 64796004. Its totient is φ = 4193280.

The previous prime is 18354389. The next prime is 18354433. The reversal of 18354420 is 2445381.

It can be written as a sum of positive squares in 2 ways, for example, as 6780816 + 11573604 = 2604^2 + 3402^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 7780 + ... + 9860.

It is an arithmetic number, because the mean of its divisors is an integer number (599963).

Almost surely, 2^18354420 is an apocalyptic number.

18354420 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 18354420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32398002).

18354420 is an abundant number, since it is smaller than the sum of its proper divisors (46441584).

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

18354420 is a wasteful number, since it uses less digits than its factorization.

18354420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2110 (or 2098 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 18354420 is about 4284.2058774060. The cubic root of 18354420 is about 263.7830517941.

The spelling of 18354420 in words is "eighteen million, three hundred fifty-four thousand, four hundred twenty".