220906 has 16 divisors (see below), whose sum is σ = 391680. Its totient is φ = 91440.

The previous prime is 220903. The next prime is 220907. The reversal of 220906 is 609022.

It is not an unprimeable number, because it can be changed into a prime (220901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180 + ... + 688.

It is an arithmetic number, because the mean of its divisors is an integer number (24480).

2²²⁰⁹⁰⁶ is an apocalyptic number.

220906 is a deficient number, since it is larger than the sum of its proper divisors (170774).

220906 is a wasteful number, since it uses less digits than its factorization.

220906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 220906 is about 470.0063829354. The cubic root of 220906 is about 60.4508628184.

Adding to 220906 its product of nonzero digits (216), we get a palindrome (221122).

Adding to 220906 its reverse (609022), we get a palindrome (829928).

The spelling of 220906 in words is "two hundred twenty thousand, nine hundred six".