20220217 has 2 divisors, whose sum is σ = 20220218. Its totient is φ = 20220216.

The previous prime is 20220173. The next prime is 20220247. The reversal of 20220217 is 71202202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11363641 + 8856576 = 3371^2 + 2976^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20220217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20220217.

It is not a weakly prime, because it can be changed into another prime (20220247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10110108 + 10110109.

It is an arithmetic number, because the mean of its divisors is an integer number (10110109).

Almost surely, 2^20220217 is an apocalyptic number.

It is an amenable number.

20220217 is a deficient number, since it is larger than the sum of its proper divisors (1).

20220217 is an equidigital number, since it uses as much as digits as its factorization.

20220217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 20220217 is about 4496.6895601097. The cubic root of 20220217 is about 272.4343954518.

Adding to 20220217 its reverse (71202202), we get a palindrome (91422419).

The spelling of 20220217 in words is "twenty million, two hundred twenty thousand, two hundred seventeen".