20895317 has 2 divisors, whose sum is σ = 20895318. Its totient is φ = 20895316.

The previous prime is 20895289. The next prime is 20895319. The reversal of 20895317 is 71359802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16859236 + 4036081 = 4106^2 + 2009^2 .

It is a cyclic number.

It is not a de Polignac number, because 20895317 - 2⁶ = 20895253 is a prime.

It is a super-2 number, since 2×20895317² = 873228545060978, which contains 22 as substring.

Together with 20895319, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20895319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10447658 + 10447659.

It is an arithmetic number, because the mean of its divisors is an integer number (10447659).

Almost surely, 2^20895317 is an apocalyptic number.

It is an amenable number.

20895317 is a deficient number, since it is larger than the sum of its proper divisors (1).

20895317 is an equidigital number, since it uses as much as digits as its factorization.

20895317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 20895317 is about 4571.1395734543. The cubic root of 20895317 is about 275.4332212986.

It can be divided in two parts, 20895 and 317, that added together give a palindrome (21212).

The spelling of 20895317 in words is "twenty million, eight hundred ninety-five thousand, three hundred seventeen".