220020217 has 2 divisors, whose sum is σ = 220020218. Its totient is φ = 220020216.

The previous prime is 220020191. The next prime is 220020233. The reversal of 220020217 is 712020022.

It is an a-pointer prime, because the next prime (220020233) can be obtained adding 220020217 to its sum of digits (16).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212314041 + 7706176 = 14571^2 + 2776^2 .

It is a cyclic number.

It is not a de Polignac number, because 220020217 - 2⁷ = 220020089 is a prime.

It is equal to p_12123610 and since 220020217 and 12123610 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 220020217.

It is not a weakly prime, because it can be changed into another prime (220026217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110010108 + 110010109.

It is an arithmetic number, because the mean of its divisors is an integer number (110010109).

Almost surely, 2^220020217 is an apocalyptic number.

It is an amenable number.

220020217 is a deficient number, since it is larger than the sum of its proper divisors (1).

220020217 is an equidigital number, since it uses as much as digits as its factorization.

220020217 is an evil number, because the sum of its binary digits is even.

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

The square root of 220020217 is about 14833.0784734660. The cubic root of 220020217 is about 603.6995649622.

Adding to 220020217 its reverse (712020022), we get a palindrome (932040239).

The spelling of 220020217 in words is "two hundred twenty million, twenty thousand, two hundred seventeen".