Factorizer is an easy-to-use program that finds factors, primes, prime decompositions, and pairs of primes. The program's simple design and quick results make it a great option for users doing this kind of math.
Factorizer's interface is not beautiful, but it is clean and intuitive, with all of its functions clearly displayed on one screen. You enter a number or range of numbers and then simply click a radio button to select factors, prime numbers, prime pairs, etc. The results are displayed in a text box from which you can easily cut and paste the data into another application. In addition to these basic functions, Factorizer offers graphs that plot integers with prime factors of n, EK values, and Palmen color frequencies. You can also set a filter condition to restrict the numbers considered by the program to positive integers in a particular sequence. All of these features were easy to use and produced quick results. The program comes with a brief built-in Help file, but all of the program's features are explained in a well-written online user guide that includes examples and screenshots.
Factorizer has a free trial that doesn't expire, but it factors numbers only up to 2000 and images of histograms cannot be saved. The program comes as a zip file and installs and uninstalls without issues. We recommend this program to anyone who needs a quick and reliable way to find factors or prime numbers.