2820 is nontrivially palindromic in base 9.
It is a plaindrome in base 7 and base 13.
It is a nialpdrome in base 15.
It is an unprimeable number.
22820 is an apocalyptic number.
2820 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 2820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4032).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
2820 is a wasteful number, since it uses less digits than its factorization.
2820 is an evil number, because the sum of its binary digits is even.
The square root of 2820 is about 53.1036721894. The cubic root of 2820 is about 14.1280764437.
The spelling of 2820 in words is "two thousand, eight hundred twenty".