220456209 has 4 divisors (see below), whose sum is σ = 293941616. Its totient is φ = 146970804.

The previous prime is 220456169. The next prime is 220456213. The reversal of 220456209 is 902654022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 220456209 - 2²⁰ = 219407633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220456109) 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 3 ways as a sum of consecutive naturals, for example, 36742699 + ... + 36742704.

It is an arithmetic number, because the mean of its divisors is an integer number (73485404).

Almost surely, 2^220456209 is an apocalyptic number.

It is an amenable number.

220456209 is a deficient number, since it is larger than the sum of its proper divisors (73485407).

220456209 is an equidigital number, since it uses as much as digits as its factorization.

220456209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73485406.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 220456209 is about 14847.7678120315. The cubic root of 220456209 is about 604.0980654845.

The spelling of 220456209 in words is "two hundred twenty million, four hundred fifty-six thousand, two hundred nine".