Formula
Test d up to √n; when n mod d = 0, include d and n/d once.
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- Positive integers up to 10 billion. Negative divisors are not listed. Zero has infinitely many nonzero integer divisors and is excluded.
Example Calculation
Example inputs
- Positive integer: 36
36 has 9 positive divisors with sum 91.
Frequently asked questions
How do I use this calculator?
Enter positive integer. The result updates automatically. Use Reset to restore the example values.
What method does it use?
Test d up to √n; when n mod d = 0, include d and n/d once.. Positive integers up to 10 billion. Negative divisors are not listed. Zero has infinitely many nonzero integer divisors and is excluded.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.