19984965

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{11}}^4\times {\mathrm{13}}^1$

素因数の和:72

約数の個数: 80

約数和(自身を含む): 43290240

約数和(自身を除く): 23305275

約数列:

[1, 3, 5, 7, 11, 13, 15, 21, 33, 35, 39, 55, 65, 77, 91, 105, 121, 143, 165, 195, 231, 273, 363, 385, 429, 455, 605, 715, 847, 1001, 1155, 1331, 1365, 1573, 1815, 2145, 2541, 3003, 3993, 4235, 4719, 5005, 6655, 7865, 9317, 11011, 12705, 14641, 15015, 17303, 19965, 23595, 27951, 33033, 43923, 46585, 51909, 55055, 73205, 86515, 102487, 121121, 139755, 165165, 190333, 219615, 259545, 307461, 363363, 512435, 570999, 605605, 951665, 1332331, 1537305, 1816815, 2854995, 3996993, 6661655, 19984965]

約数ペア:

[(1, 19984965), (3, 6661655), (5, 3996993), (7, 2854995), (11, 1816815), (13, 1537305), (15, 1332331), (21, 951665), (33, 605605), (35, 570999), (39, 512435), (55, 363363), (65, 307461), (77, 259545), (91, 219615), (105, 190333), (121, 165165), (143, 139755), (165, 121121), (195, 102487), (231, 86515), (273, 73205), (363, 55055), (385, 51909), (429, 46585), (455, 43923), (605, 33033), (715, 27951), (847, 23595), (1001, 19965), (1155, 17303), (1331, 15015), (1365, 14641), (1573, 12705), (1815, 11011), (2145, 9317), (2541, 7865), (3003, 6655), (3993, 5005), (4235, 4719)]