20563163 has 2 divisors, whose sum is σ = 20563164. Its totient is φ = 20563162.

The previous prime is 20563141. The next prime is 20563189. The reversal of 20563163 is 36136502.

It is an a-pointer prime, because the next prime (20563189) can be obtained adding 20563163 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20563163 - 2¹² = 20559067 is a prime.

It is not a weakly prime, because it can be changed into another prime (20563133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10281581 + 10281582.

It is an arithmetic number, because the mean of its divisors is an integer number (10281582).

Almost surely, 2^20563163 is an apocalyptic number.

20563163 is a deficient number, since it is larger than the sum of its proper divisors (1).

20563163 is an equidigital number, since it uses as much as digits as its factorization.

20563163 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 20563163 is about 4534.6623909614. The cubic root of 20563163 is about 273.9659813556.

Adding to 20563163 its reverse (36136502), we get a palindrome (56699665).

The spelling of 20563163 in words is "twenty million, five hundred sixty-three thousand, one hundred sixty-three".