20217163 has 2 divisors, whose sum is σ = 20217164. Its totient is φ = 20217162.

The previous prime is 20217137. The next prime is 20217173. The reversal of 20217163 is 36171202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20217163 - 2¹⁷ = 20086091 is a prime.

It is not a weakly prime, because it can be changed into another prime (20217103) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10108581 + 10108582.

It is an arithmetic number, because the mean of its divisors is an integer number (10108582).

Almost surely, 2^20217163 is an apocalyptic number.

20217163 is a deficient number, since it is larger than the sum of its proper divisors (1).

20217163 is an equidigital number, since it uses as much as digits as its factorization.

20217163 is an evil number, because the sum of its binary digits is even.

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

The square root of 20217163 is about 4496.3499641376. The cubic root of 20217163 is about 272.4206788740.

Adding to 20217163 its reverse (36171202), we get a palindrome (56388365).

The spelling of 20217163 in words is "twenty million, two hundred seventeen thousand, one hundred sixty-three".