20517220

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{131}}^1\times {\mathrm{191}}^1$

素因数の和:372

約数の個数: 48

約数和(自身を含む): 44706816

約数和(自身を除く): 24189596

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 131, 164, 191, 205, 262, 382, 410, 524, 655, 764, 820, 955, 1310, 1910, 2620, 3820, 5371, 7831, 10742, 15662, 21484, 25021, 26855, 31324, 39155, 50042, 53710, 78310, 100084, 107420, 125105, 156620, 250210, 500420, 1025861, 2051722, 4103444, 5129305, 10258610, 20517220]

約数ペア:

[(1, 20517220), (2, 10258610), (4, 5129305), (5, 4103444), (10, 2051722), (20, 1025861), (41, 500420), (82, 250210), (131, 156620), (164, 125105), (191, 107420), (205, 100084), (262, 78310), (382, 53710), (410, 50042), (524, 39155), (655, 31324), (764, 26855), (820, 25021), (955, 21484), (1310, 15662), (1910, 10742), (2620, 7831), (3820, 5371)]