220747009 has 6 divisors (see below), whose sum is σ = 256787394. Its totient is φ = 189211680.

The previous prime is 220746991. The next prime is 220747013. The reversal of 220747009 is 900747022.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 220433409 + 313600 = 14847^2 + 560^2 .

It is not a de Polignac number, because 220747009 - 2¹⁹ = 220222721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220747309) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2252472 + ... + 2252569.

It is an arithmetic number, because the mean of its divisors is an integer number (42797899).

Almost surely, 2^220747009 is an apocalyptic number.

It is an amenable number.

220747009 is a deficient number, since it is larger than the sum of its proper divisors (36040385).

220747009 is an equidigital number, since it uses as much as digits as its factorization.

220747009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4505055 (or 4505048 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 220747009 is about 14857.5573025986. The cubic root of 220747009 is about 604.3635672409.

The spelling of 220747009 in words is "two hundred twenty million, seven hundred forty-seven thousand, nine".