20342425217 has 2 divisors, whose sum is σ = 20342425218. Its totient is φ = 20342425216.

The previous prime is 20342425189. The next prime is 20342425223. The reversal of 20342425217 is 71252424302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20216289856 + 126135361 = 142184^2 + 11231^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20342425217 is a prime.

It is not a weakly prime, because it can be changed into another prime (20342425717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10171212608 + 10171212609.

It is an arithmetic number, because the mean of its divisors is an integer number (10171212609).

Almost surely, 2^20342425217 is an apocalyptic number.

It is an amenable number.

20342425217 is a deficient number, since it is larger than the sum of its proper divisors (1).

20342425217 is an equidigital number, since it uses as much as digits as its factorization.

20342425217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 32.

Adding to 20342425217 its reverse (71252424302), we get a palindrome (91594849519).

The spelling of 20342425217 in words is "twenty billion, three hundred forty-two million, four hundred twenty-five thousand, two hundred seventeen".