220309 has 4 divisors (see below), whose sum is σ = 221920. Its totient is φ = 218700.

The previous prime is 220307. The next prime is 220327. The reversal of 220309 is 903022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 220309 - 2¹ = 220307 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 220292 and 220301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220301) 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, 579 + ... + 880.

It is an arithmetic number, because the mean of its divisors is an integer number (55480).

2²²⁰³⁰⁹ is an apocalyptic number.

It is an amenable number.

220309 is a deficient number, since it is larger than the sum of its proper divisors (1611).

220309 is a wasteful number, since it uses less digits than its factorization.

220309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1610.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 220309 is about 469.3708555077. The cubic root of 220309 is about 60.3963573962.

It can be divided in two parts, 220 and 309, that added together give a square (529 = 23²).

The spelling of 220309 in words is "two hundred twenty thousand, three hundred nine".