220766 has 16 divisors (see below), whose sum is σ = 407904. Its totient is φ = 87264.

The previous prime is 220757. The next prime is 220771. The reversal of 220766 is 667022.

It is a happy number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 220766.

It is an unprimeable number.

220766 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 in 7 ways as a sum of consecutive naturals, for example, 425 + ... + 788.

It is an arithmetic number, because the mean of its divisors is an integer number (25494).

2²²⁰⁷⁶⁶ is an apocalyptic number.

220766 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

220766 is a deficient number, since it is larger than the sum of its proper divisors (187138).

220766 is a wasteful number, since it uses less digits than its factorization.

220766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1235.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 220766 is about 469.8574251834. The cubic root of 220766 is about 60.4380898000.

Adding to 220766 its reverse (667022), we get a palindrome (887788).

The spelling of 220766 in words is "two hundred twenty thousand, seven hundred sixty-six".