21000768260

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{127}}^1\times {\mathrm{421}}^1\times {\mathrm{479}}^1$

素因数の和:1077

約数の個数: 96

約数和(自身を含む): 45736427520

約数和(自身を除く): 24735659260

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 127, 164, 205, 254, 410, 421, 479, 508, 635, 820, 842, 958, 1270, 1684, 1916, 2105, 2395, 2540, 4210, 4790, 5207, 8420, 9580, 10414, 17261, 19639, 20828, 26035, 34522, 39278, 52070, 53467, 60833, 69044, 78556, 86305, 98195, 104140, 106934, 121666, 172610, 196390, 201659, 213868, 243332, 267335, 304165, 345220, 392780, 403318, 534670, 608330, 806636, 1008295, 1069340, 1216660, 2016590, 2192147, 2494153, 4033180, 4384294, 4988306, 8268019, 8768588, 9976612, 10960735, 12470765, 16536038, 21921470, 24941530, 25610693, 33072076, 41340095, 43842940, 49883060, 51221386, 82680190, 102442772, 128053465, 165360380, 256106930, 512213860, 1050038413, 2100076826, 4200153652, 5250192065, 10500384130, 21000768260]

約数ペア:

[(1, 21000768260), (2, 10500384130), (4, 5250192065), (5, 4200153652), (10, 2100076826), (20, 1050038413), (41, 512213860), (82, 256106930), (127, 165360380), (164, 128053465), (205, 102442772), (254, 82680190), (410, 51221386), (421, 49883060), (479, 43842940), (508, 41340095), (635, 33072076), (820, 25610693), (842, 24941530), (958, 21921470), (1270, 16536038), (1684, 12470765), (1916, 10960735), (2105, 9976612), (2395, 8768588), (2540, 8268019), (4210, 4988306), (4790, 4384294), (5207, 4033180), (8420, 2494153), (9580, 2192147), (10414, 2016590), (17261, 1216660), (19639, 1069340), (20828, 1008295), (26035, 806636), (34522, 608330), (39278, 534670), (52070, 403318), (53467, 392780), (60833, 345220), (69044, 304165), (78556, 267335), (86305, 243332), (98195, 213868), (104140, 201659), (106934, 196390), (121666, 172610)]