220769 has 4 divisors (see below), whose sum is σ = 221844. Its totient is φ = 219696.

The previous prime is 220757. The next prime is 220771. The reversal of 220769 is 967022.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 70225 + 150544 = 265^2 + 388^2 .

It is a cyclic number.

It is not a de Polignac number, because 220769 - 2⁸ = 220513 is a prime.

It is a super-2 number, since 2×220769² = 97477902722, which contains 22 as substring.

It is a Duffinian 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 220769.

It is not an unprimeable number, because it can be changed into a prime (220709) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122 + ... + 675.

It is an arithmetic number, because the mean of its divisors is an integer number (55461).

2²²⁰⁷⁶⁹ is an apocalyptic number.

It is an amenable number.

220769 is a deficient number, since it is larger than the sum of its proper divisors (1075).

220769 is an equidigital number, since it uses as much as digits as its factorization.

220769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1074.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 220769 is about 469.8606176304. The cubic root of 220769 is about 60.4383635641.

It can be divided in two parts, 220 and 769, that added together give a palindrome (989).

The spelling of 220769 in words is "two hundred twenty thousand, seven hundred sixty-nine".