20317597 has 2 divisors, whose sum is σ = 20317598. Its totient is φ = 20317596.

The previous prime is 20317571. The next prime is 20317613. The reversal of 20317597 is 79571302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14907321 + 5410276 = 3861^2 + 2326^2 .

It is a cyclic number.

It is not a de Polignac number, because 20317597 - 2¹¹ = 20315549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20312597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10158798 + 10158799.

It is an arithmetic number, because the mean of its divisors is an integer number (10158799).

Almost surely, 2^20317597 is an apocalyptic number.

It is an amenable number.

20317597 is a deficient number, since it is larger than the sum of its proper divisors (1).

20317597 is an equidigital number, since it uses as much as digits as its factorization.

20317597 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13230, while the sum is 34.

The square root of 20317597 is about 4507.5045202418. The cubic root of 20317597 is about 272.8710407214.

Adding to 20317597 its reverse (79571302), we get a palindrome (99888899).

The spelling of 20317597 in words is "twenty million, three hundred seventeen thousand, five hundred ninety-seven".