220730 has 8 divisors (see below), whose sum is σ = 397332. Its totient is φ = 88288.

The previous prime is 220721. The next prime is 220747. The reversal of 220730 is 37022.

220730 = T₁₆₄ + T₁₆₅ + ... + T₁₇₈.

220730 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 208849 + 11881 = 457^2 + 109^2 .

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

It is an Ulam number.

It is a Curzon number.

It is an unprimeable number.

220730 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 3 ways as a sum of consecutive naturals, for example, 11027 + ... + 11046.

2²²⁰⁷³⁰ is an apocalyptic number.

220730 is a deficient number, since it is larger than the sum of its proper divisors (176602).

220730 is a wasteful number, since it uses less digits than its factorization.

220730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22080.

The product of its (nonzero) digits is 84, while the sum is 14.

The square root of 220730 is about 469.8191141280. The cubic root of 220730 is about 60.4348044367.

Adding to 220730 its reverse (37022), we get a palindrome (257752).

The spelling of 220730 in words is "two hundred twenty thousand, seven hundred thirty".