21397220

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{47}}^1\times {\mathrm{103}}^1$

素因数の和:189

約数の個数: 96

約数和(自身を含む): 52835328

約数和(自身を除く): 31438108

約数列:

[1, 2, 4, 5, 10, 13, 17, 20, 26, 34, 47, 52, 65, 68, 85, 94, 103, 130, 170, 188, 206, 221, 235, 260, 340, 412, 442, 470, 515, 611, 799, 884, 940, 1030, 1105, 1222, 1339, 1598, 1751, 2060, 2210, 2444, 2678, 3055, 3196, 3502, 3995, 4420, 4841, 5356, 6110, 6695, 7004, 7990, 8755, 9682, 10387, 12220, 13390, 15980, 17510, 19364, 20774, 22763, 24205, 26780, 35020, 41548, 45526, 48410, 51935, 62933, 82297, 91052, 96820, 103870, 113815, 125866, 164594, 207740, 227630, 251732, 314665, 329188, 411485, 455260, 629330, 822970, 1069861, 1258660, 1645940, 2139722, 4279444, 5349305, 10698610, 21397220]

約数ペア:

[(1, 21397220), (2, 10698610), (4, 5349305), (5, 4279444), (10, 2139722), (13, 1645940), (17, 1258660), (20, 1069861), (26, 822970), (34, 629330), (47, 455260), (52, 411485), (65, 329188), (68, 314665), (85, 251732), (94, 227630), (103, 207740), (130, 164594), (170, 125866), (188, 113815), (206, 103870), (221, 96820), (235, 91052), (260, 82297), (340, 62933), (412, 51935), (442, 48410), (470, 45526), (515, 41548), (611, 35020), (799, 26780), (884, 24205), (940, 22763), (1030, 20774), (1105, 19364), (1222, 17510), (1339, 15980), (1598, 13390), (1751, 12220), (2060, 10387), (2210, 9682), (2444, 8755), (2678, 7990), (3055, 7004), (3196, 6695), (3502, 6110), (3995, 5356), (4420, 4841)]