21049875

素因数分解:

$3^7\times 5^3\times 7^1\times {\mathrm{11}}^1$

素因数の和:54

約数の個数: 128

約数和(自身を含む): 49121280

約数和(自身を除く): 28071405

約数列:

[1, 3, 5, 7, 9, 11, 15, 21, 25, 27, 33, 35, 45, 55, 63, 75, 77, 81, 99, 105, 125, 135, 165, 175, 189, 225, 231, 243, 275, 297, 315, 375, 385, 405, 495, 525, 567, 675, 693, 729, 825, 875, 891, 945, 1125, 1155, 1215, 1375, 1485, 1575, 1701, 1925, 2025, 2079, 2187, 2475, 2625, 2673, 2835, 3375, 3465, 3645, 4125, 4455, 4725, 5103, 5775, 6075, 6237, 7425, 7875, 8019, 8505, 9625, 10125, 10395, 10935, 12375, 13365, 14175, 15309, 17325, 18225, 18711, 22275, 23625, 24057, 25515, 28875, 30375, 31185, 37125, 40095, 42525, 51975, 54675, 56133, 66825, 70875, 76545, 86625, 91125, 93555, 111375, 120285, 127575, 155925, 168399, 200475, 212625, 259875, 273375, 280665, 334125, 382725, 467775, 601425, 637875, 779625, 841995, 1002375, 1403325, 1913625, 2338875, 3007125, 4209975, 7016625, 21049875]

約数ペア:

[(1, 21049875), (3, 7016625), (5, 4209975), (7, 3007125), (9, 2338875), (11, 1913625), (15, 1403325), (21, 1002375), (25, 841995), (27, 779625), (33, 637875), (35, 601425), (45, 467775), (55, 382725), (63, 334125), (75, 280665), (77, 273375), (81, 259875), (99, 212625), (105, 200475), (125, 168399), (135, 155925), (165, 127575), (175, 120285), (189, 111375), (225, 93555), (231, 91125), (243, 86625), (275, 76545), (297, 70875), (315, 66825), (375, 56133), (385, 54675), (405, 51975), (495, 42525), (525, 40095), (567, 37125), (675, 31185), (693, 30375), (729, 28875), (825, 25515), (875, 24057), (891, 23625), (945, 22275), (1125, 18711), (1155, 18225), (1215, 17325), (1375, 15309), (1485, 14175), (1575, 13365), (1701, 12375), (1925, 10935), (2025, 10395), (2079, 10125), (2187, 9625), (2475, 8505), (2625, 8019), (2673, 7875), (2835, 7425), (3375, 6237), (3465, 6075), (3645, 5775), (4125, 5103), (4455, 4725)]