Adding to 20480 its reverse (8402), we get a palindrome (28882).
It is an Ulam number.
It is a nialpdrome in base 4, base 8 and base 16.
It is a zygodrome in base 4.
It is a congruent number.
In principle, a polygon with 20480 sides can be constructed with ruler and compass.
220480 is an apocalyptic number.
20480 is a gapful number since it is divisible by the number (20) 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 20480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24573).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20480 is an frugal number, since it uses more digits than its factorization.
20480 is an evil number, because the sum of its binary digits is even.
The square root of 20480 is about 143.1083505600. The cubic root of 20480 is about 27.3596151468.
The spelling of 20480 in words is "twenty thousand, four hundred eighty".