20320171 has 2 divisors, whose sum is σ = 20320172. Its totient is φ = 20320170.

The previous prime is 20320103. The next prime is 20320187. The reversal of 20320171 is 17102302.

It is a happy number.

It is an a-pointer prime, because the next prime (20320187) can be obtained adding 20320171 to its sum of digits (16).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20320171 - 2⁷ = 20320043 is a prime.

It is not a weakly prime, because it can be changed into another prime (20326171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160085 + 10160086.

It is an arithmetic number, because the mean of its divisors is an integer number (10160086).

Almost surely, 2^20320171 is an apocalyptic number.

20320171 is a deficient number, since it is larger than the sum of its proper divisors (1).

20320171 is an equidigital number, since it uses as much as digits as its factorization.

20320171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 20320171 is about 4507.7900350393. The cubic root of 20320171 is about 272.8825634160.

Adding to 20320171 its reverse (17102302), we get a palindrome (37422473).

The spelling of 20320171 in words is "twenty million, three hundred twenty thousand, one hundred seventy-one".