20242 has 8 divisors (see below), whose sum is σ = 31500.
Its totient is φ = 9744.
The previous prime is 20233. The next prime is 20249. The reversal of 20242 is 24202.
It is a happy number.
It can be written as a sum of positive squares in 2 ways, for example, as 19881 + 361 = 141^2 + 19^2
It is a sphenic number, since it is the product of 3 distinct primes.
It is not an unprimeable number, because it can be changed into a prime (20249) by changing a digit.
20242 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117 + ... + 232.
220242 is an apocalyptic number.
20242 is a deficient number, since it is larger than the sum of its proper divisors (11258).
20242 is a wasteful number, since it uses less digits than its factorization.
20242 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 380.
The product of its (nonzero) digits is 32, while the sum is 10.
The square root of 20242 is about 142.2743827961.
The cubic root of 20242 is about 27.2532190457.
Adding to 20242 its reverse (24202), we get a palindrome (44444).
It can be divided in two parts, 20 and 242, that added together give a palindrome (262).
The spelling of 20242 in words is "twenty thousand, two hundred forty-two", and thus it is an iban number.