220505 has 4 divisors (see below), whose sum is σ = 264612. Its totient is φ = 176400.

The previous prime is 220471. The next prime is 220511. The reversal of 220505 is 505022.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 175561 + 44944 = 419^2 + 212^2 .

It is a de Polignac number, because none of the positive numbers 2^k-220505 is a prime.

It is a super-3 number, since 3×220505³ = 32164483335862875, which contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 220505.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22046 + ... + 22055.

It is an arithmetic number, because the mean of its divisors is an integer number (66153).

2²²⁰⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

220505 is a deficient number, since it is larger than the sum of its proper divisors (44107).

220505 is an equidigital number, since it uses as much as digits as its factorization.

220505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44106.

The product of its (nonzero) digits is 100, while the sum is 14.

The square root of 220505 is about 469.5795992161. The cubic root of 220505 is about 60.4142628189.

Adding to 220505 its reverse (505022), we get a palindrome (725527).

The spelling of 220505 in words is "two hundred twenty thousand, five hundred five".