220240 has 20 divisors (see below), whose sum is σ = 512244. Its totient is φ = 88064.

The previous prime is 220217. The next prime is 220243. The reversal of 220240 is 42022.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 150544 + 69696 = 388^2 + 264^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220243) 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, 1297 + ... + 1456.

2²²⁰²⁴⁰ is an apocalyptic number.

220240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

220240 is an abundant number, since it is smaller than the sum of its proper divisors (292004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

220240 is a wasteful number, since it uses less digits than its factorization.

220240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2766 (or 2760 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 10.

The square root of 220240 is about 469.2973471052. The cubic root of 220240 is about 60.3900514293.

Adding to 220240 its reverse (42022), we get a palindrome (262262).

The spelling of 220240 in words is "two hundred twenty thousand, two hundred forty", and thus it is an iban number.