It is a happy number.
It is a plaindrome in base 14.
It is a congruent number.
245820 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 45820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50400).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
45820 is a wasteful number, since it uses less digits than its factorization.
45820 is an evil number, because the sum of its binary digits is even.
The square root of 45820 is about 214.0560674216. The cubic root of 45820 is about 35.7836822111.
The spelling of 45820 in words is "forty-five thousand, eight hundred twenty".