220745 has 24 divisors (see below), whose sum is σ = 332424. Its totient is φ = 139776.

The previous prime is 220721. The next prime is 220747. The reversal of 220745 is 547022.

It can be written as a sum of positive squares in 4 ways, for example, as 67081 + 153664 = 259^2 + 392^2 .

It is not a de Polignac number, because 220745 - 2⁶ = 220681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220747) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4139 + ... + 4191.

It is an arithmetic number, because the mean of its divisors is an integer number (13851).

2²²⁰⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

220745 is a deficient number, since it is larger than the sum of its proper divisors (111679).

220745 is a wasteful number, since it uses less digits than its factorization.

220745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89 (or 82 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 20.

The square root of 220745 is about 469.8350774474. The cubic root of 220745 is about 60.4361733815.

Adding to 220745 its reverse (547022), we get a palindrome (767767).

The spelling of 220745 in words is "two hundred twenty thousand, seven hundred forty-five".