220816917 has 12 divisors (see below), whose sum is σ = 335745280. Its totient is φ = 139463208.

The previous prime is 220816913. The next prime is 220816931. The reversal of 220816917 is 719618022.

It is not a de Polignac number, because 220816917 - 2² = 220816913 is a prime.

It is a super-2 number, since 2×220816917² = 97520221666769778, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220816913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 645493 + ... + 645834.

Almost surely, 2^220816917 is an apocalyptic number.

It is an amenable number.

220816917 is a deficient number, since it is larger than the sum of its proper divisors (114928363).

220816917 is a wasteful number, since it uses less digits than its factorization.

220816917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1291352 (or 1291349 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 220816917 is about 14859.9097238173. The cubic root of 220816917 is about 604.4273588022.

The spelling of 220816917 in words is "two hundred twenty million, eight hundred sixteen thousand, nine hundred seventeen".