20321243 has 2 divisors, whose sum is σ = 20321244. Its totient is φ = 20321242.

The previous prime is 20321237. The next prime is 20321261. The reversal of 20321243 is 34212302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20321243 - 2⁸ = 20320987 is a prime.

It is not a weakly prime, because it can be changed into another prime (20321233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160621 + 10160622.

It is an arithmetic number, because the mean of its divisors is an integer number (10160622).

Almost surely, 2^20321243 is an apocalyptic number.

20321243 is a deficient number, since it is larger than the sum of its proper divisors (1).

20321243 is an equidigital number, since it uses as much as digits as its factorization.

20321243 is an evil number, because the sum of its binary digits is even.

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

The square root of 20321243 is about 4507.9089387431. The cubic root of 20321243 is about 272.8873620135.

Adding to 20321243 its reverse (34212302), we get a palindrome (54533545).

The spelling of 20321243 in words is "twenty million, three hundred twenty-one thousand, two hundred forty-three".