220723 has 4 divisors (see below), whose sum is σ = 232360. Its totient is φ = 209088.

The previous prime is 220721. The next prime is 220747. The reversal of 220723 is 327022.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 220723 - 2¹ = 220721 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220697 and 220706.

It is not an unprimeable number, because it can be changed into a prime (220721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5790 + ... + 5827.

It is an arithmetic number, because the mean of its divisors is an integer number (58090).

2²²⁰⁷²³ is an apocalyptic number.

220723 is a deficient number, since it is larger than the sum of its proper divisors (11637).

220723 is a wasteful number, since it uses less digits than its factorization.

220723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11636.

The product of its (nonzero) digits is 168, while the sum is 16.

The square root of 220723 is about 469.8116643933. The cubic root of 220723 is about 60.4341655746.

Adding to 220723 its reverse (327022), we get a palindrome (547745).

The spelling of 220723 in words is "two hundred twenty thousand, seven hundred twenty-three", and thus it is an iban number.