220445317 has 4 divisors (see below), whose sum is σ = 230029920. Its totient is φ = 210860716.

The previous prime is 220445191. The next prime is 220445321. The reversal of 220445317 is 713544022.

220445317 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 713544022 = 2 ⋅356772011.

It is a cyclic number.

It is not a de Polignac number, because 220445317 - 2⁷ = 220445189 is a prime.

It is a super-2 number, since 2×220445317² = 97192275574460978, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220445377) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4792267 + ... + 4792312.

It is an arithmetic number, because the mean of its divisors is an integer number (57507480).

Almost surely, 2^220445317 is an apocalyptic number.

It is an amenable number.

220445317 is a deficient number, since it is larger than the sum of its proper divisors (9584603).

220445317 is an equidigital number, since it uses as much as digits as its factorization.

220445317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9584602.

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 220445317 is about 14847.4010183601. The cubic root of 220445317 is about 604.0881165026.

Adding to 220445317 its reverse (713544022), we get a palindrome (933989339).

The spelling of 220445317 in words is "two hundred twenty million, four hundred forty-five thousand, three hundred seventeen".