20006243 has 2 divisors, whose sum is σ = 20006244. Its totient is φ = 20006242.

The previous prime is 20006227. The next prime is 20006279. The reversal of 20006243 is 34260002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20006243 - 2⁴ = 20006227 is a prime.

It is not a weakly prime, because it can be changed into another prime (20006543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10003121 + 10003122.

It is an arithmetic number, because the mean of its divisors is an integer number (10003122).

Almost surely, 2^20006243 is an apocalyptic number.

20006243 is a deficient number, since it is larger than the sum of its proper divisors (1).

20006243 is an equidigital number, since it uses as much as digits as its factorization.

20006243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 20006243 is about 4472.8338891580. The cubic root of 20006243 is about 271.4700022366.

Adding to 20006243 its reverse (34260002), we get a palindrome (54266245).

The spelling of 20006243 in words is "twenty million, six thousand, two hundred forty-three".