Adding to 20442 its reverse (24402), we get a palindrome (44844).
It is a sphenic number, since it is the product of 3 distinct primes.
20442 is an admirable number.
It is a nialpdrome in base 14.
220442 is an apocalyptic number.
20442 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20442 is a wasteful number, since it uses less digits than its factorization.
20442 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 3412.
The square root of 20442 is about 142.9755223806. The cubic root of 20442 is about 27.3426830332.
The spelling of 20442 in words is "twenty thousand, four hundred forty-two", and thus it is an iban number.