20423 is nontrivially palindromic in base 12.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is a Duffinian number.
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 20423.
220423 is an apocalyptic number.
20423 is a wasteful number, since it uses less digits than its factorization.
20423 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1584.
The square root of 20423 is about 142.9090619940. The cubic root of 20423 is about 27.3342091067.
Adding to 20423 its reverse (32402), we get a palindrome (52825).
The spelling of 20423 in words is "twenty thousand, four hundred twenty-three", and thus it is an iban number.