220443913 has 8 divisors (see below), whose sum is σ = 235724040. Its totient is φ = 205420800.

The previous prime is 220443901. The next prime is 220443931. The reversal of 220443913 is 319344022.

It can be written as a sum of positive squares in 4 ways, for example, as 189117504 + 31326409 = 13752^2 + 5597^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 220443913 - 2²¹ = 218346761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (220443973) 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 7 ways as a sum of consecutive naturals, for example, 62478 + ... + 65911.

It is an arithmetic number, because the mean of its divisors is an integer number (29465505).

Almost surely, 2^220443913 is an apocalyptic number.

It is an amenable number.

220443913 is a deficient number, since it is larger than the sum of its proper divisors (15280127).

220443913 is a wasteful number, since it uses less digits than its factorization.

220443913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128507.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 220443913 is about 14847.3537372826. The cubic root of 220443913 is about 604.0868340356.

Adding to 220443913 its reverse (319344022), we get a palindrome (539787935).

The spelling of 220443913 in words is "two hundred twenty million, four hundred forty-three thousand, nine hundred thirteen".