20425403171 has 2 divisors, whose sum is σ = 20425403172. Its totient is φ = 20425403170.

The previous prime is 20425403147. The next prime is 20425403177. The reversal of 20425403171 is 17130452402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20425403171 - 2²² = 20421208867 is a prime.

It is not a weakly prime, because it can be changed into another prime (20425403177) 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, 10212701585 + 10212701586.

It is an arithmetic number, because the mean of its divisors is an integer number (10212701586).

Almost surely, 2^20425403171 is an apocalyptic number.

20425403171 is a deficient number, since it is larger than the sum of its proper divisors (1).

20425403171 is an equidigital number, since it uses as much as digits as its factorization.

20425403171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 29.

Adding to 20425403171 its reverse (17130452402), we get a palindrome (37555855573).

The spelling of 20425403171 in words is "twenty billion, four hundred twenty-five million, four hundred three thousand, one hundred seventy-one".