220385717 has 2 divisors, whose sum is σ = 220385718. Its totient is φ = 220385716.

The previous prime is 220385699. The next prime is 220385719. The reversal of 220385717 is 717583022.

220385717 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216855076 + 3530641 = 14726^2 + 1879^2 .

It is a cyclic number.

It is not a de Polignac number, because 220385717 - 2¹⁰ = 220384693 is a prime.

Together with 220385719, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220385719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110192858 + 110192859.

It is an arithmetic number, because the mean of its divisors is an integer number (110192859).

Almost surely, 2^220385717 is an apocalyptic number.

It is an amenable number.

220385717 is a deficient number, since it is larger than the sum of its proper divisors (1).

220385717 is an equidigital number, since it uses as much as digits as its factorization.

220385717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 220385717 is about 14845.3937974040. The cubic root of 220385717 is about 604.0336708054.

The spelling of 220385717 in words is "two hundred twenty million, three hundred eighty-five thousand, seven hundred seventeen".