divisor function
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English
Noun
divisor function (plural divisor functions)
- (mathematics) A function yielding the sum of the divisors of an integer. It is denoted by the Greek letter σ (sigma).
- The value of the divisor function for 20 is 1 + 2 + 4 + 5 + 10 + 20 = 42, denoted as σ(20) = 42.