20630317 has 2 divisors, whose sum is σ = 20630318. Its totient is φ = 20630316.

The previous prime is 20630293. The next prime is 20630327. The reversal of 20630317 is 71303602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20196036 + 434281 = 4494^2 + 659^2 .

It is a cyclic number.

It is not a de Polignac number, because 20630317 - 2⁷ = 20630189 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20630327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10315158 + 10315159.

It is an arithmetic number, because the mean of its divisors is an integer number (10315159).

Almost surely, 2^20630317 is an apocalyptic number.

It is an amenable number.

20630317 is a deficient number, since it is larger than the sum of its proper divisors (1).

20630317 is an equidigital number, since it uses as much as digits as its factorization.

20630317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 22.

The square root of 20630317 is about 4542.0608758580. The cubic root of 20630317 is about 274.2638914283.

Adding to 20630317 its reverse (71303602), we get a palindrome (91933919).

The spelling of 20630317 in words is "twenty million, six hundred thirty thousand, three hundred seventeen".