20617213 has 2 divisors, whose sum is σ = 20617214. Its totient is φ = 20617212.

The previous prime is 20617151. The next prime is 20617229. The reversal of 20617213 is 31271602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16826404 + 3790809 = 4102^2 + 1947^2 .

It is a cyclic number.

It is not a de Polignac number, because 20617213 - 2¹³ = 20609021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20617013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10308606 + 10308607.

It is an arithmetic number, because the mean of its divisors is an integer number (10308607).

Almost surely, 2^20617213 is an apocalyptic number.

It is an amenable number.

20617213 is a deficient number, since it is larger than the sum of its proper divisors (1).

20617213 is an equidigital number, since it uses as much as digits as its factorization.

20617213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 20617213 is about 4540.6181297264. The cubic root of 20617213 is about 274.2058099935.

Adding to 20617213 its reverse (31271602), we get a palindrome (51888815).

The spelling of 20617213 in words is "twenty million, six hundred seventeen thousand, two hundred thirteen".