20422243 has 2 divisors, whose sum is σ = 20422244. Its totient is φ = 20422242.

The previous prime is 20422189. The next prime is 20422247. The reversal of 20422243 is 34222402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20422243 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20422243.

It is not a weakly prime, because it can be changed into another prime (20422247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10211121 + 10211122.

It is an arithmetic number, because the mean of its divisors is an integer number (10211122).

Almost surely, 2^20422243 is an apocalyptic number.

20422243 is a deficient number, since it is larger than the sum of its proper divisors (1).

20422243 is an equidigital number, since it uses as much as digits as its factorization.

20422243 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 20422243 is about 4519.0975869083. The cubic root of 20422243 is about 273.3387137879.

Adding to 20422243 its reverse (34222402), we get a palindrome (54644645).

The spelling of 20422243 in words is "twenty million, four hundred twenty-two thousand, two hundred forty-three".