Number System — Formula Sheet
XAT · Quantitative Ability & Data Interpretation
Free Number System formula sheet for XAT Quantitative Ability & Data Interpretation 2026 — all important formulas, equations, and constants for quick reference.
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Important formulas and equations from Number System for XAT Quantitative Ability & Data Interpretation.
Formulas — Number System
Types of Numbers
Prime Number Tests
Check divisibility up to √NHCF and LCM
HCF(a,b) × LCM(a,b) = a × bHCF = Product of lowest powers of common prime factorsLCM = Product of highest powers of all prime factorsFactors and Divisors
Number of factors = (a+1)(b+1)(c+1)...Sum of factors = (p₁⁰+p₁¹+...+p₁ᵃ)(p₂⁰+p₂¹+...+p₂ᵇ)...Number of even factors = a × (b+1)(c+1)...Number of odd factors = (b+1)(c+1)...Get the complete formula sheet with derivations — continue in Super Tutor
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