20/20 Primes and Factor Trees is made and published by Walter Kissach. AppBrain is an independent app data site and isn't affiliated with Walter Kissach. The app name, icon, screenshots and description belong to Walter Kissach and are shown as published on the App Store.
AppBrain's verdict
Removed- Rating on App Store
- 5.00
- 1 ratings
- Last updated
- September 4, 2025
20/20 Primes and Factor Trees is no longer on the App Store. It had too few ratings to say what users thought.
Competitors
Similar apps and more from Walter KissachMore from Walter Kissach
Releases
Updates seen on the App Store- Version
- 9.1
- Launched
- before 2010
No changelog data
User feedback
Ratings and reviews on the App StoreComments on 20/20 Primes and Factor Trees for iOS
We don't have enough comments to show example comments. Please check back later.
Technology
Found in the app by AppBrain- Price
- $0.99
- App size
- 2.61 MB
- Content rating
- Everyone
Technologies used by 20/20 Primes and Factor Trees
About the app and developer
About 20/20 Primes and Factor Trees
20/20 Primes and Factor Trees was an education app developed by Walter Kissach. It was removed from the App Store Dec 26, 2025.
User Ratings
20/20 Primes and Factor Trees was rated 5.00 out of 5 stars, based on one rating ratings.
App Information
20/20 Primes and Factor Trees cost $0.99. The app size was 2.61 MB. The last available version was 9.1. The last update was on September 4, 2025.
Technical Requirements
The app had a content rating of Everyone. The app had been available on the App Store since before 2010.
Developer information for Walter Kissach
Address:
Frequently asked questions about 20/20 Primes and Factor Trees
Is 20/20 Primes and Factor Trees free?
No. 20/20 Primes and Factor Trees cost $0.99 on the App Store.
Is 20/20 Primes and Factor Trees still available?
No. 20/20 Primes and Factor Trees was removed from the App Store. We last saw it there Dec 26, 2025.
How large is 20/20 Primes and Factor Trees?
20/20 Primes and Factor Trees is 2.61 MB.
Is 20/20 Primes and Factor Trees suitable for children?
App Store rates the content of 20/20 Primes and Factor Trees as suitable for everyone.
How do people rate 20/20 Primes and Factor Trees?
20/20 Primes and Factor Trees had one rating of 5.00 stars on the App Store.
Who made 20/20 Primes and Factor Trees?
20/20 Primes and Factor Trees was developed by Walter Kissach. It was listed in the education category on the App Store.
What are the best alternatives to 20/20 Primes and Factor Trees?
People looking at 20/20 Primes and Factor Trees also look at these education apps: FormulaBar, Prime Factorization Deluxe, Factors and Multiples, Napier's Bones Simulation, multiplication drills: X.
Store listing
By Walter Kissach, from the App StoreSimilar apps
Description by Walter Kissach Written by the developer, not by AppBrain. Click to read.
Prime factorization :
- Prime factorization by factor trees
LCM or Least Common Multiple :
- LCM by prime factorization
- LCM by listing multiples
GCD or Greatest Common Divisor :
- GCD by prime factorization
- GCD by listing divisors
You develop understanding quickly as you work with the calculator and see each step of the process in detail.