20988990

素因数分解:

$2^1\times 3^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{37}}^1\times {\mathrm{191}}^1$

素因数の和:255

約数の個数: 128

約数和(自身を含む): 63037440

約数和(自身を除く): 42048450

約数列:

[1, 2, 3, 5, 6, 9, 10, 11, 15, 18, 22, 27, 30, 33, 37, 45, 54, 55, 66, 74, 90, 99, 110, 111, 135, 165, 185, 191, 198, 222, 270, 297, 330, 333, 370, 382, 407, 495, 555, 573, 594, 666, 814, 955, 990, 999, 1110, 1146, 1221, 1485, 1665, 1719, 1910, 1998, 2035, 2101, 2442, 2865, 2970, 3330, 3438, 3663, 4070, 4202, 4995, 5157, 5730, 6105, 6303, 7067, 7326, 8595, 9990, 10314, 10505, 10989, 12210, 12606, 14134, 17190, 18315, 18909, 21010, 21201, 21978, 25785, 31515, 35335, 36630, 37818, 42402, 51570, 54945, 56727, 63030, 63603, 70670, 77737, 94545, 106005, 109890, 113454, 127206, 155474, 189090, 190809, 212010, 233211, 283635, 318015, 381618, 388685, 466422, 567270, 636030, 699633, 777370, 954045, 1166055, 1399266, 1908090, 2098899, 2332110, 3498165, 4197798, 6996330, 10494495, 20988990]

約数ペア:

[(1, 20988990), (2, 10494495), (3, 6996330), (5, 4197798), (6, 3498165), (9, 2332110), (10, 2098899), (11, 1908090), (15, 1399266), (18, 1166055), (22, 954045), (27, 777370), (30, 699633), (33, 636030), (37, 567270), (45, 466422), (54, 388685), (55, 381618), (66, 318015), (74, 283635), (90, 233211), (99, 212010), (110, 190809), (111, 189090), (135, 155474), (165, 127206), (185, 113454), (191, 109890), (198, 106005), (222, 94545), (270, 77737), (297, 70670), (330, 63603), (333, 63030), (370, 56727), (382, 54945), (407, 51570), (495, 42402), (555, 37818), (573, 36630), (594, 35335), (666, 31515), (814, 25785), (955, 21978), (990, 21201), (999, 21010), (1110, 18909), (1146, 18315), (1221, 17190), (1485, 14134), (1665, 12606), (1719, 12210), (1910, 10989), (1998, 10505), (2035, 10314), (2101, 9990), (2442, 8595), (2865, 7326), (2970, 7067), (3330, 6303), (3438, 6105), (3663, 5730), (4070, 5157), (4202, 4995)]