18313320 has 64 divisors (see below), whose sum is σ = 55520640. Its totient is φ = 4832000.

The previous prime is 18313307. The next prime is 18313327. The reversal of 18313320 is 2331381.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18313327) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 11365 + ... + 12875.

It is an arithmetic number, because the mean of its divisors is an integer number (867510).

Almost surely, 2^18313320 is an apocalyptic number.

18313320 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 18313320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27760320).

18313320 is an abundant number, since it is smaller than the sum of its proper divisors (37207320).

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

18313320 is a wasteful number, since it uses less digits than its factorization.

18313320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1626 (or 1622 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 18313320 is about 4279.4065009064. The cubic root of 18313320 is about 263.5860132289.

It can be divided in two parts, 1831 and 3320, that added together give a triangular number (5151 = T₁₀₁).

The spelling of 18313320 in words is "eighteen million, three hundred thirteen thousand, three hundred twenty".