Adding to 20306 its reverse (60302), we get a palindrome (80608).
It is a happy number.
20306 is nontrivially palindromic in base 5.
It is a nialpdrome in base 13.
It is a zygodrome in base 5.
It is a congruent number.
It is an unprimeable number.
220306 is an apocalyptic number.
20306 is a gapful number since it is divisible by the number (26) formed by its first and last digit.
20306 is a wasteful number, since it uses less digits than its factorization.
20306 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 97.
The square root of 20306 is about 142.4991228043. The cubic root of 20306 is about 27.2819113850.
The spelling of 20306 in words is "twenty thousand, three hundred six".