18481320 has 192 divisors, whose sum is σ = 70761600. Its totient is φ = 4124160.

The previous prime is 18481291. The next prime is 18481321. The reversal of 18481320 is 2318481.

It is not an unprimeable number, because it can be changed into a prime (18481321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 51301 + ... + 51659.

It is an arithmetic number, because the mean of its divisors is an integer number (368550).

Almost surely, 2^18481320 is an apocalyptic number.

18481320 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 18481320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35380800).

18481320 is an abundant number, since it is smaller than the sum of its proper divisors (52280280).

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

18481320 is a wasteful number, since it uses less digits than its factorization.

18481320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400 (or 393 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 18481320 is about 4298.9905791941. The cubic root of 18481320 is about 264.3895763470.

The spelling of 18481320 in words is "eighteen million, four hundred eighty-one thousand, three hundred twenty".