20008243 has 2 divisors, whose sum is σ = 20008244. Its totient is φ = 20008242.

The previous prime is 20008223. The next prime is 20008249. The reversal of 20008243 is 34280002.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20008243 - 2⁵ = 20008211 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20008243.

It is not a weakly prime, because it can be changed into another prime (20008249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10004121 + 10004122.

It is an arithmetic number, because the mean of its divisors is an integer number (10004122).

Almost surely, 2^20008243 is an apocalyptic number.

20008243 is a deficient number, since it is larger than the sum of its proper divisors (1).

20008243 is an equidigital number, since it uses as much as digits as its factorization.

20008243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 20008243 is about 4473.0574554772. The cubic root of 20008243 is about 271.4790481114.

Adding to 20008243 its reverse (34280002), we get a palindrome (54288245).

The spelling of 20008243 in words is "twenty million, eight thousand, two hundred forty-three".