220823 has 4 divisors (see below), whose sum is σ = 230448. Its totient is φ = 211200.

The previous prime is 220811. The next prime is 220841. The reversal of 220823 is 328022.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 328022 = 2 ⋅164011.

It is a cyclic number.

It is not a de Polignac number, because 220823 - 2⁴ = 220807 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220873) 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, 4778 + ... + 4823.

It is an arithmetic number, because the mean of its divisors is an integer number (57612).

2²²⁰⁸²³ is an apocalyptic number.

220823 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

220823 is a deficient number, since it is larger than the sum of its proper divisors (9625).

220823 is an equidigital number, since it uses as much as digits as its factorization.

220823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9624.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 220823 is about 469.9180779668. The cubic root of 220823 is about 60.4432908947.

Adding to 220823 its reverse (328022), we get a palindrome (548845).

The spelling of 220823 in words is "two hundred twenty thousand, eight hundred twenty-three".