20563313 has 2 divisors, whose sum is σ = 20563314. Its totient is φ = 20563312.

The previous prime is 20563307. The next prime is 20563327. The reversal of 20563313 is 31336502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17405584 + 3157729 = 4172^2 + 1777^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20563313 is a prime.

It is not a weakly prime, because it can be changed into another prime (20563343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10281656 + 10281657.

It is an arithmetic number, because the mean of its divisors is an integer number (10281657).

Almost surely, 2^20563313 is an apocalyptic number.

It is an amenable number.

20563313 is a deficient number, since it is larger than the sum of its proper divisors (1).

20563313 is an equidigital number, since it uses as much as digits as its factorization.

20563313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 23.

The square root of 20563313 is about 4534.6789302000. The cubic root of 20563313 is about 273.9666475112.

Adding to 20563313 its reverse (31336502), we get a palindrome (51899815).

The spelling of 20563313 in words is "twenty million, five hundred sixty-three thousand, three hundred thirteen".