220145 has 4 divisors (see below), whose sum is σ = 264180. Its totient is φ = 176112.

The previous prime is 220141. The next prime is 220147. The reversal of 220145 is 541022.

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 47089 + 173056 = 217^2 + 416^2 .

It is a cyclic number.

It is not a de Polignac number, because 220145 - 2² = 220141 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 220145.

It is not an unprimeable number, because it can be changed into a prime (220141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22010 + ... + 22019.

It is an arithmetic number, because the mean of its divisors is an integer number (66045).

2²²⁰¹⁴⁵ is an apocalyptic number.

It is an amenable number.

220145 is a deficient number, since it is larger than the sum of its proper divisors (44035).

220145 is an equidigital number, since it uses as much as digits as its factorization.

220145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44034.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 220145 is about 469.1961210411. The cubic root of 220145 is about 60.3813671455.

Adding to 220145 its reverse (541022), we get a palindrome (761167).

The spelling of 220145 in words is "two hundred twenty thousand, one hundred forty-five".