18821360 has 80 divisors (see below), whose sum is σ = 46764864. Its totient is φ = 7028736.

The previous prime is 18821353. The next prime is 18821389. The reversal of 18821360 is 6312881.

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

It is a congruent number.

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, 97424 + ... + 97616.

Almost surely, 2^18821360 is an apocalyptic number.

18821360 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 18821360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23382432).

18821360 is an abundant number, since it is smaller than the sum of its proper divisors (27943504).

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

18821360 is a wasteful number, since it uses less digits than its factorization.

18821360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282 (or 276 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 18821360 is about 4338.3591368166. The cubic root of 18821360 is about 266.0012437050.

The spelling of 18821360 in words is "eighteen million, eight hundred twenty-one thousand, three hundred sixty".