20717167 has 2 divisors, whose sum is σ = 20717168. Its totient is φ = 20717166.

The previous prime is 20717159. The next prime is 20717171. The reversal of 20717167 is 76171702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20717167 - 2³ = 20717159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20717867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10358583 + 10358584.

It is an arithmetic number, because the mean of its divisors is an integer number (10358584).

Almost surely, 2^20717167 is an apocalyptic number.

20717167 is a deficient number, since it is larger than the sum of its proper divisors (1).

20717167 is an equidigital number, since it uses as much as digits as its factorization.

20717167 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4116, while the sum is 31.

The square root of 20717167 is about 4551.6114728742. The cubic root of 20717167 is about 274.6482201678.

Adding to 20717167 its reverse (76171702), we get a palindrome (96888869).

The spelling of 20717167 in words is "twenty million, seven hundred seventeen thousand, one hundred sixty-seven".