18163320 has 96 divisors (see below), whose sum is σ = 63406800. Its totient is φ = 4150272.

The previous prime is 18163279. The next prime is 18163331. The reversal of 18163320 is 2336181.

It is a super-3 number, since 3×18163320³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4336 + ... + 7424.

Almost surely, 2^18163320 is an apocalyptic number.

18163320 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 18163320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31703400).

18163320 is an abundant number, since it is smaller than the sum of its proper divisors (45243480).

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

18163320 is a wasteful number, since it uses less digits than its factorization.

18163320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3117 (or 3106 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 18163320 is about 4261.8446710315. The cubic root of 18163320 is about 262.8643828459.

The spelling of 18163320 in words is "eighteen million, one hundred sixty-three thousand, three hundred twenty".