220404 has 12 divisors (see below), whose sum is σ = 514304. Its totient is φ = 73464.

The previous prime is 220403. The next prime is 220411. The reversal of 220404 is 404022.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Harshad number since it is a multiple of its sum of digits (12), and also a Moran number because the ratio is a prime number: 18367 = 220404 / (2 + 2 + 0 + 4 + 0 + 4).

It is a self number, because there is not a number n which added to its sum of digits gives 220404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220403) 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, 9172 + ... + 9195.

2²²⁰⁴⁰⁴ is an apocalyptic number.

It is an amenable number.

220404 is an abundant number, since it is smaller than the sum of its proper divisors (293900).

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

220404 is a wasteful number, since it uses less digits than its factorization.

220404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18374 (or 18372 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 12.

The square root of 220404 is about 469.4720438961. The cubic root of 220404 is about 60.4050373706.

Adding to 220404 its reverse (404022), we get a palindrome (624426).

The spelling of 220404 in words is "two hundred twenty thousand, four hundred four", and thus it is an iban number.