20042443 has 2 divisors, whose sum is σ = 20042444. Its totient is φ = 20042442.

The previous prime is 20042417. The next prime is 20042459. The reversal of 20042443 is 34424002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20042443 - 2¹³ = 20034251 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20042443.

It is not a weakly prime, because it can be changed into another prime (20042413) 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 as a sum of consecutive naturals, namely, 10021221 + 10021222.

It is an arithmetic number, because the mean of its divisors is an integer number (10021222).

Almost surely, 2^20042443 is an apocalyptic number.

20042443 is a deficient number, since it is larger than the sum of its proper divisors (1).

20042443 is an equidigital number, since it uses as much as digits as its factorization.

20042443 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 20042443 is about 4476.8787117812. The cubic root of 20042443 is about 271.6336393705.

Adding to 20042443 its reverse (34424002), we get a palindrome (54466445).

The spelling of 20042443 in words is "twenty million, forty-two thousand, four hundred forty-three".