Last updated: April 2026
Factors of n are all integers that divide n exactly with no remainder. Max recommended: 10,000,000.
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A factor divides a number exactly. A multiple is the result of multiplying a number by an integer.
Keep dividing by prime numbers until the remaining value is 1. The primes used are the prime factors.
A prime number has exactly two positive factors: 1 and itself.
A perfect number equals the sum of its proper factors. For example, 6 = 1 + 2 + 3.
This calculator is designed to help you understand the likely number before you make a decision or start an application.
Your result should be checked against official UK guidance, especially if your circumstances include dependants, exemptions, prior leave, or a complex immigration history.
Treat the figure as a planning tool rather than legal advice. Where the answer affects an application deadline or major payment, speak to an authorised adviser.
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