It is a tau number, because it is divible by the number of its divisors (120).
It is a nialpdrome in base 8.
It is a self number, because there is not a number n which added to its sum of digits gives 1720320.
21720320 is an apocalyptic number.
1720320 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 1720320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3145632).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1720320 is an frugal number, since it uses more digits than its factorization.
1720320 is an evil number, because the sum of its binary digits is even.
The square root of 1720320 is about 1311.6096980428. The cubic root of 1720320 is about 119.8219581955.
Adding to 1720320 its reverse (230271), we get a palindrome (1950591).
The spelling of 1720320 in words is "one million, seven hundred twenty thousand, three hundred twenty".