18822320 has 80 divisors (see below), whose sum is σ = 48559392. Its totient is φ = 6727680.

The previous prime is 18822319. The next prime is 18822337. The reversal of 18822320 is 2322881.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 18822320.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64094 + ... + 64386.

Almost surely, 2^18822320 is an apocalyptic number.

18822320 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 18822320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24279696).

18822320 is an abundant number, since it is smaller than the sum of its proper divisors (29737072).

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

18822320 is a wasteful number, since it uses less digits than its factorization.

18822320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390 (or 384 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 18822320 is about 4338.4697763151. The cubic root of 18822320 is about 266.0057661704.

The spelling of 18822320 in words is "eighteen million, eight hundred twenty-two thousand, three hundred twenty".