220917 has 8 divisors (see below), whose sum is σ = 296800. Its totient is φ = 146160.

The previous prime is 220907. The next prime is 220919. The reversal of 220917 is 719022.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 220917 - 2⁴ = 220901 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 220893 and 220902.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 220917.

It is not an unprimeable number, because it can be changed into a prime (220919) 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 7 ways as a sum of consecutive naturals, for example, 459 + ... + 807.

It is an arithmetic number, because the mean of its divisors is an integer number (37100).

2²²⁰⁹¹⁷ is an apocalyptic number.

It is an amenable number.

220917 is a deficient number, since it is larger than the sum of its proper divisors (75883).

220917 is a wasteful number, since it uses less digits than its factorization.

220917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 220917 is about 470.0180847584. The cubic root of 220917 is about 60.4518661841.

Adding to 220917 its reverse (719022), we get a palindrome (939939).

The spelling of 220917 in words is "two hundred twenty thousand, nine hundred seventeen".