It is a tau number, because it is divible by the number of its divisors (40).
It is a nialpdrome in base 8.
It is a congruent number.
17920 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
17920 is a Friedman number, since it can be written as 70*2^(9-1), using all its digits and the basic arithmetic operations.
217920 is an apocalyptic number.
17920 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 17920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24552).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
17920 is an frugal number, since it uses more digits than its factorization.
17920 is an odious number, because the sum of its binary digits is odd.
The square root of 17920 is about 133.8656042455. The cubic root of 17920 is about 26.1685304815.
The spelling of 17920 in words is "seventeen thousand, nine hundred twenty".