20425252217 has 2 divisors, whose sum is σ = 20425252218. Its totient is φ = 20425252216.

The previous prime is 20425252213. The next prime is 20425252229. The reversal of 20425252217 is 71225252402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18886730041 + 1538522176 = 137429^2 + 39224^2 .

It is a cyclic number.

It is not a de Polignac number, because 20425252217 - 2² = 20425252213 is a prime.

It is not a weakly prime, because it can be changed into another prime (20425252213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10212626108 + 10212626109.

It is an arithmetic number, because the mean of its divisors is an integer number (10212626109).

Almost surely, 2^20425252217 is an apocalyptic number.

It is an amenable number.

20425252217 is a deficient number, since it is larger than the sum of its proper divisors (1).

20425252217 is an equidigital number, since it uses as much as digits as its factorization.

20425252217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22400, while the sum is 32.

The spelling of 20425252217 in words is "twenty billion, four hundred twenty-five million, two hundred fifty-two thousand, two hundred seventeen".