20442241 has 4 divisors (see below), whose sum is σ = 20994772. Its totient is φ = 19889712.

The previous prime is 20442203. The next prime is 20442269. The reversal of 20442241 is 14224402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14224402 = 2 ⋅7112201.

It can be written as a sum of positive squares in 2 ways, for example, as 10857025 + 9585216 = 3295^2 + 3096^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20442241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20442281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 276210 + ... + 276283.

It is an arithmetic number, because the mean of its divisors is an integer number (5248693).

Almost surely, 2^20442241 is an apocalyptic number.

It is an amenable number.

20442241 is a deficient number, since it is larger than the sum of its proper divisors (552531).

20442241 is an equidigital number, since it uses as much as digits as its factorization.

20442241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552530.

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 20442241 is about 4521.3096553985. The cubic root of 20442241 is about 273.4279048453.

Adding to 20442241 its reverse (14224402), we get a palindrome (34666643).

The spelling of 20442241 in words is "twenty million, four hundred forty-two thousand, two hundred forty-one".