20045243 has 2 divisors, whose sum is σ = 20045244. Its totient is φ = 20045242.

The previous prime is 20045237. The next prime is 20045257. The reversal of 20045243 is 34254002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20045243 - 2⁸ = 20044987 is a prime.

It is not a weakly prime, because it can be changed into another prime (20041243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10022621 + 10022622.

It is an arithmetic number, because the mean of its divisors is an integer number (10022622).

Almost surely, 2^20045243 is an apocalyptic number.

20045243 is a deficient number, since it is larger than the sum of its proper divisors (1).

20045243 is an equidigital number, since it uses as much as digits as its factorization.

20045243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 20045243 is about 4477.1914187356. The cubic root of 20045243 is about 271.6462881741.

Adding to 20045243 its reverse (34254002), we get a palindrome (54299245).

The spelling of 20045243 in words is "twenty million, forty-five thousand, two hundred forty-three".