It is a tau number, because it is divible by the number of its divisors (72).
It is a nialpdrome in base 8 and base 12.
It is a zygodrome in base 12.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 18720.
It is an unprimeable number.
218720 is an apocalyptic number.
18720 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 18720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34398).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
18720 is a wasteful number, since it uses less digits than its factorization.
18720 is an evil number, because the sum of its binary digits is even.
The square root of 18720 is about 136.8210510119. The cubic root of 18720 is about 26.5522878852.
The spelling of 18720 in words is "eighteen thousand, seven hundred twenty".