18980320 has 48 divisors (see below), whose sum is σ = 45102960. Its totient is φ = 7547904.

The previous prime is 18980309. The next prime is 18980321. The reversal of 18980320 is 2308981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18980321) 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 7 ways as a sum of consecutive naturals, for example, 49891 + ... + 50269.

It is an arithmetic number, because the mean of its divisors is an integer number (939645).

Almost surely, 2^18980320 is an apocalyptic number.

18980320 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 18980320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22551480).

18980320 is an abundant number, since it is smaller than the sum of its proper divisors (26122640).

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

18980320 is a wasteful number, since it uses less digits than its factorization.

18980320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707 (or 699 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 18980320 is about 4356.6409078555. The cubic root of 18980320 is about 266.7480029668.

The spelling of 18980320 in words is "eighteen million, nine hundred eighty thousand, three hundred twenty".