21957460

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{47}}^2\times {\mathrm{71}}^1$

素因数の和:181

約数の個数: 72

約数和(自身を含む): 54601344

約数和(自身を除く): 32643884

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 47, 70, 71, 94, 140, 142, 188, 235, 284, 329, 355, 470, 497, 658, 710, 940, 994, 1316, 1420, 1645, 1988, 2209, 2485, 3290, 3337, 4418, 4970, 6580, 6674, 8836, 9940, 11045, 13348, 15463, 16685, 22090, 23359, 30926, 33370, 44180, 46718, 61852, 66740, 77315, 93436, 116795, 154630, 156839, 233590, 309260, 313678, 467180, 627356, 784195, 1097873, 1568390, 2195746, 3136780, 4391492, 5489365, 10978730, 21957460]

約数ペア:

[(1, 21957460), (2, 10978730), (4, 5489365), (5, 4391492), (7, 3136780), (10, 2195746), (14, 1568390), (20, 1097873), (28, 784195), (35, 627356), (47, 467180), (70, 313678), (71, 309260), (94, 233590), (140, 156839), (142, 154630), (188, 116795), (235, 93436), (284, 77315), (329, 66740), (355, 61852), (470, 46718), (497, 44180), (658, 33370), (710, 30926), (940, 23359), (994, 22090), (1316, 16685), (1420, 15463), (1645, 13348), (1988, 11045), (2209, 9940), (2485, 8836), (3290, 6674), (3337, 6580), (4418, 4970)]