It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 20430.
220430 is an apocalyptic number.
It is a practical number, because each smaller number is the sum of distinct divisors of 20430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26676).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20430 is a wasteful number, since it uses less digits than its factorization.
20430 is an evil number, because the sum of its binary digits is even.
The square root of 20430 is about 142.9335509949. The cubic root of 20430 is about 27.3373316908.
Adding to 20430 its reverse (3402), we get a palindrome (23832).
The spelling of 20430 in words is "twenty thousand, four hundred thirty".