220730661 has 24 divisors (see below), whose sum is σ = 324305280. Its totient is φ = 144645696.

The previous prime is 220730639. The next prime is 220730707. The reversal of 220730661 is 166037022.

It is a happy number.

It is not a de Polignac number, because 220730661 - 2¹⁹ = 220206373 is a prime.

It is a super-3 number, since 3×220730661³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220730161) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 200665 + ... + 201761.

It is an arithmetic number, because the mean of its divisors is an integer number (13512720).

Almost surely, 2^220730661 is an apocalyptic number.

It is an amenable number.

220730661 is a deficient number, since it is larger than the sum of its proper divisors (103574619).

220730661 is a wasteful number, since it uses less digits than its factorization.

220730661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1465 (or 1462 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 220730661 is about 14857.0071346823. The cubic root of 220730661 is about 604.3486476284.

Adding to 220730661 its reverse (166037022), we get a palindrome (386767683).

The spelling of 220730661 in words is "two hundred twenty million, seven hundred thirty thousand, six hundred sixty-one".