20852317 has 2 divisors, whose sum is σ = 20852318. Its totient is φ = 20852316.

The previous prime is 20852309. The next prime is 20852323. The reversal of 20852317 is 71325802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14830201 + 6022116 = 3851^2 + 2454^2 .

It is a cyclic number.

It is not a de Polignac number, because 20852317 - 2³ = 20852309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20852347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10426158 + 10426159.

It is an arithmetic number, because the mean of its divisors is an integer number (10426159).

Almost surely, 2^20852317 is an apocalyptic number.

It is an amenable number.

20852317 is a deficient number, since it is larger than the sum of its proper divisors (1).

20852317 is an equidigital number, since it uses as much as digits as its factorization.

20852317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 20852317 is about 4566.4337288523. The cubic root of 20852317 is about 275.2441556169.

It can be divided in two parts, 208 and 52317, that added together give a palindrome (52525).

The spelling of 20852317 in words is "twenty million, eight hundred fifty-two thousand, three hundred seventeen".