20442223 has 4 divisors (see below), whose sum is σ = 20451600.
Its totient is φ = 20432848.
The previous prime is 20442203. The next prime is 20442269. The reversal of 20442223 is 32224402.
Adding to 20442223 its reverse (32224402), we get a palindrome (52666625).
It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.
It is a cyclic number.
It is not a de Polignac number, because 20442223 - 221 = 18345071 is a prime.
It is a Duffinian number.
It is a self number, because there is not a number n which added to its sum of digits gives 20442223.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (20442203) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 486 + ... + 6412.
It is an arithmetic number, because the mean of its divisors is an integer number (5112900).
Almost surely, 220442223 is an apocalyptic number.
20442223 is a deficient number, since it is larger than the sum of its proper divisors (9377).
20442223 is an equidigital number, since it uses as much as digits as its factorization.
20442223 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 9376.
The product of its (nonzero) digits is 768, while the sum is 19.
The square root of 20442223 is about 4521.3076648244.
The cubic root of 20442223 is about 273.4278245915.
The spelling of 20442223 in words is "twenty million, four hundred forty-two thousand, two hundred twenty-three".