220236661 has 16 divisors (see below), whose sum is σ = 234420480. Its totient is φ = 206483200.

The previous prime is 220236659. The next prime is 220236697. The reversal of 220236661 is 166632022.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 220236661 - 2¹ = 220236659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220236631) 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 15 ways as a sum of consecutive naturals, for example, 262080 + ... + 262918.

It is an arithmetic number, because the mean of its divisors is an integer number (14651280).

Almost surely, 2^220236661 is an apocalyptic number.

It is an amenable number.

220236661 is a deficient number, since it is larger than the sum of its proper divisors (14183819).

220236661 is a wasteful number, since it uses less digits than its factorization.

220236661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1076.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 220236661 is about 14840.3726705228. The cubic root of 220236661 is about 603.8974624192.

Adding to 220236661 its reverse (166632022), we get a palindrome (386868683).

The spelling of 220236661 in words is "two hundred twenty million, two hundred thirty-six thousand, six hundred sixty-one".