220904 has 16 divisors (see below), whose sum is σ = 422820. Its totient is φ = 108160.

The previous prime is 220903. The next prime is 220907. The reversal of 220904 is 409022.

It can be written as a sum of positive squares in 2 ways, for example, as 220900 + 4 = 470^2 + 2^2 .

It is a plaindrome in base 15.

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

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, 164 + ... + 684.

2²²⁰⁹⁰⁴ is an apocalyptic number.

It is an amenable number.

220904 is a deficient number, since it is larger than the sum of its proper divisors (201916).

220904 is a wasteful number, since it uses less digits than its factorization.

220904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580 (or 576 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 220904 is about 470.0042552999. The cubic root of 220904 is about 60.4506803848.

Adding to 220904 its reverse (409022), we get a palindrome (629926).

The spelling of 220904 in words is "two hundred twenty thousand, nine hundred four".