220736 has 14 divisors (see below), whose sum is σ = 438150. Its totient is φ = 110336.

The previous prime is 220721. The next prime is 220747. The reversal of 220736 is 637022.

220736 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 only one way, i.e., 118336 + 102400 = 344^2 + 320^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 220736.

It is an unprimeable number.

220736 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1661 + ... + 1788.

2²²⁰⁷³⁶ is an apocalyptic number.

It is an amenable number.

220736 is a deficient number, since it is larger than the sum of its proper divisors (217414).

220736 is an equidigital number, since it uses as much as digits as its factorization.

220736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3461 (or 3451 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 220736 is about 469.8254995208. The cubic root of 220736 is about 60.4353520221.

Adding to 220736 its reverse (637022), we get a palindrome (857758).

The spelling of 220736 in words is "two hundred twenty thousand, seven hundred thirty-six".