2220605 has 4 divisors (see below), whose sum is σ = 2664732. Its totient is φ = 1776480.

The previous prime is 2220553. The next prime is 2220643. The reversal of 2220605 is 5060222.

2220605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5060222 = 2 ⋅2530111.

It can be written as a sum of positive squares in 2 ways, for example, as 597529 + 1623076 = 773^2 + 1274^2 .

It is not a de Polignac number, because 2220605 - 2⁸ = 2220349 is a prime.

It is a d-powerful number, because it can be written as 2¹⁰ + 2¹² + 2¹⁸ + 0 + 6³ + 0 + 5⁹ .

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

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, 222056 + ... + 222065.

It is an arithmetic number, because the mean of its divisors is an integer number (666183).

2^2220605 is an apocalyptic number.

It is an amenable number.

2220605 is a deficient number, since it is larger than the sum of its proper divisors (444127).

2220605 is an equidigital number, since it uses as much as digits as its factorization.

2220605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444126.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 2220605 is about 1490.1694534515. The cubic root of 2220605 is about 130.4639243019.

Adding to 2220605 its reverse (5060222), we get a palindrome (7280827).

The spelling of 2220605 in words is "two million, two hundred twenty thousand, six hundred five".