220312404 has 72 divisors (see below), whose sum is σ = 602714112. Its totient is φ = 67452480.

The previous prime is 220312403. The next prime is 220312409. The reversal of 220312404 is 404213022.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220312403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 103309 + ... + 105419.

Almost surely, 2^220312404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 220312404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (301357056).

220312404 is an abundant number, since it is smaller than the sum of its proper divisors (382401708).

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

220312404 is a wasteful number, since it uses less digits than its factorization.

220312404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2357 (or 2352 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 220312404 is about 14842.9243749337. The cubic root of 220312404 is about 603.9666845651.

Adding to 220312404 its reverse (404213022), we get a palindrome (624525426).

The spelling of 220312404 in words is "two hundred twenty million, three hundred twelve thousand, four hundred four".