220340905 has 4 divisors (see below), whose sum is σ = 264409092. Its totient is φ = 176272720.

The previous prime is 220340867. The next prime is 220340921. The reversal of 220340905 is 509043022.

It is a happy number.

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 122943744 + 97397161 = 11088^2 + 9869^2 .

It is not a de Polignac number, because 220340905 - 2¹⁹ = 219816617 is a prime.

It is a super-2 number, since 2×220340905² = 97100228832438050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 220340905.

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, 22034086 + ... + 22034095.

It is an arithmetic number, because the mean of its divisors is an integer number (66102273).

Almost surely, 2^220340905 is an apocalyptic number.

It is an amenable number.

220340905 is a deficient number, since it is larger than the sum of its proper divisors (44068187).

220340905 is an equidigital number, since it uses as much as digits as its factorization.

220340905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44068186.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 220340905 is about 14843.8844309702. The cubic root of 220340905 is about 603.9927277533.

Adding to 220340905 its reverse (509043022), we get a palindrome (729383927).

The spelling of 220340905 in words is "two hundred twenty million, three hundred forty thousand, nine hundred five".