220609 has 8 divisors (see below), whose sum is σ = 246240. Its totient is φ = 196416.

The previous prime is 220589. The next prime is 220613. The reversal of 220609 is 906022.

220609 = T₃₈₂ + T₃₈₃ + T₃₈₄.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220609 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (220699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19 + ... + 664.

It is an arithmetic number, because the mean of its divisors is an integer number (30780).

2²²⁰⁶⁰⁹ is an apocalyptic number.

220609 is the 384-th centered triangular number.

It is an amenable number.

220609 is a deficient number, since it is larger than the sum of its proper divisors (25631).

220609 is a wasteful number, since it uses less digits than its factorization.

220609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 220609 is about 469.6903235111. The cubic root of 220609 is about 60.4237593470.

220609 divided by its sum of digits (19) gives a palindrome (11611).

The spelling of 220609 in words is "two hundred twenty thousand, six hundred nine".