220915 has 16 divisors (see below), whose sum is σ = 295488. Its totient is φ = 157696.

The previous prime is 220907. The next prime is 220919. The reversal of 220915 is 519022.

It is a cyclic number.

It is not a de Polignac number, because 220915 - 2³ = 220907 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220892 and 220901.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 1899 + ... + 2011.

It is an arithmetic number, because the mean of its divisors is an integer number (18468).

2²²⁰⁹¹⁵ is an apocalyptic number.

220915 is a deficient number, since it is larger than the sum of its proper divisors (74573).

220915 is a wasteful number, since it uses less digits than its factorization.

220915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 220915 is about 470.0159571759. The cubic root of 220915 is about 60.4516837564.

Adding to 220915 its reverse (519022), we get a palindrome (739937).

The spelling of 220915 in words is "two hundred twenty thousand, nine hundred fifteen".