21001783900

素因数分解:

$2^2\times 5^2\times {\mathrm{31}}^1\times {\mathrm{89}}^1\times {\mathrm{163}}^1\times {\mathrm{467}}^1$

素因数の和:764

約数の個数: 144

約数和(自身を含む): 47966929920

約数和(自身を除く): 26965146020

約数列:

[1, 2, 4, 5, 10, 20, 25, 31, 50, 62, 89, 100, 124, 155, 163, 178, 310, 326, 356, 445, 467, 620, 652, 775, 815, 890, 934, 1550, 1630, 1780, 1868, 2225, 2335, 2759, 3100, 3260, 4075, 4450, 4670, 5053, 5518, 8150, 8900, 9340, 10106, 11036, 11675, 13795, 14477, 14507, 16300, 20212, 23350, 25265, 27590, 28954, 29014, 41563, 46700, 50530, 55180, 57908, 58028, 68975, 72385, 72535, 76121, 83126, 101060, 126325, 137950, 144770, 145070, 152242, 166252, 207815, 252650, 275900, 289540, 290140, 304484, 361925, 362675, 380605, 415630, 449717, 505300, 723850, 725350, 761210, 831260, 899434, 1039075, 1288453, 1447700, 1450700, 1522420, 1798868, 1903025, 2078150, 2248585, 2359751, 2576906, 3806050, 4156300, 4497170, 4719502, 5153812, 6442265, 6774769, 7612100, 8994340, 9439004, 11242925, 11798755, 12884530, 13549538, 22485850, 23597510, 25769060, 27099076, 32211325, 33873845, 44971700, 47195020, 58993775, 64422650, 67747690, 117987550, 128845300, 135495380, 169369225, 210017839, 235975100, 338738450, 420035678, 677476900, 840071356, 1050089195, 2100178390, 4200356780, 5250445975, 10500891950, 21001783900]

約数ペア:

[(1, 21001783900), (2, 10500891950), (4, 5250445975), (5, 4200356780), (10, 2100178390), (20, 1050089195), (25, 840071356), (31, 677476900), (50, 420035678), (62, 338738450), (89, 235975100), (100, 210017839), (124, 169369225), (155, 135495380), (163, 128845300), (178, 117987550), (310, 67747690), (326, 64422650), (356, 58993775), (445, 47195020), (467, 44971700), (620, 33873845), (652, 32211325), (775, 27099076), (815, 25769060), (890, 23597510), (934, 22485850), (1550, 13549538), (1630, 12884530), (1780, 11798755), (1868, 11242925), (2225, 9439004), (2335, 8994340), (2759, 7612100), (3100, 6774769), (3260, 6442265), (4075, 5153812), (4450, 4719502), (4670, 4497170), (5053, 4156300), (5518, 3806050), (8150, 2576906), (8900, 2359751), (9340, 2248585), (10106, 2078150), (11036, 1903025), (11675, 1798868), (13795, 1522420), (14477, 1450700), (14507, 1447700), (16300, 1288453), (20212, 1039075), (23350, 899434), (25265, 831260), (27590, 761210), (28954, 725350), (29014, 723850), (41563, 505300), (46700, 449717), (50530, 415630), (55180, 380605), (57908, 362675), (58028, 361925), (68975, 304484), (72385, 290140), (72535, 289540), (76121, 275900), (83126, 252650), (101060, 207815), (126325, 166252), (137950, 152242), (144770, 145070)]