220389905 has 8 divisors (see below), whose sum is σ = 264551784. Its totient is φ = 176256000.

The previous prime is 220389901. The next prime is 220389907. The reversal of 220389905 is 509983022.

It can be written as a sum of positive squares in 4 ways, for example, as 39137536 + 181252369 = 6256^2 + 13463^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 220389905 - 2² = 220389901 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220389901) 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 7 ways as a sum of consecutive naturals, for example, 19415 + ... + 28595.

It is an arithmetic number, because the mean of its divisors is an integer number (33068973).

Almost surely, 2^220389905 is an apocalyptic number.

It is an amenable number.

220389905 is a deficient number, since it is larger than the sum of its proper divisors (44161879).

220389905 is an equidigital number, since it uses as much as digits as its factorization.

220389905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13987.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 220389905 is about 14845.5348505872. The cubic root of 220389905 is about 604.0374969411.

The spelling of 220389905 in words is "two hundred twenty million, three hundred eighty-nine thousand, nine hundred five".