20213317 has 2 divisors, whose sum is σ = 20213318. Its totient is φ = 20213316.

The previous prime is 20213309. The next prime is 20213351. The reversal of 20213317 is 71331202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20079361 + 133956 = 4481^2 + 366^2 .

It is a cyclic number.

It is not a de Polignac number, because 20213317 - 2³ = 20213309 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20213294 and 20213303.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20213717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106658 + 10106659.

It is an arithmetic number, because the mean of its divisors is an integer number (10106659).

Almost surely, 2^20213317 is an apocalyptic number.

It is an amenable number.

20213317 is a deficient number, since it is larger than the sum of its proper divisors (1).

20213317 is an equidigital number, since it uses as much as digits as its factorization.

20213317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 20213317 is about 4495.9222635628. The cubic root of 20213317 is about 272.4034031831.

Adding to 20213317 its reverse (71331202), we get a palindrome (91544519).

The spelling of 20213317 in words is "twenty million, two hundred thirteen thousand, three hundred seventeen".