20781915

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{947}}^1$

素因数の和:992

約数の個数: 64

約数和(自身を含む): 43683840

約数和(自身を除く): 22901925

約数列:

[1, 3, 5, 7, 11, 15, 19, 21, 33, 35, 55, 57, 77, 95, 105, 133, 165, 209, 231, 285, 385, 399, 627, 665, 947, 1045, 1155, 1463, 1995, 2841, 3135, 4389, 4735, 6629, 7315, 10417, 14205, 17993, 19887, 21945, 31251, 33145, 52085, 53979, 72919, 89965, 99435, 125951, 156255, 197923, 218757, 269895, 364595, 377853, 593769, 629755, 989615, 1093785, 1385461, 1889265, 2968845, 4156383, 6927305, 20781915]

約数ペア:

[(1, 20781915), (3, 6927305), (5, 4156383), (7, 2968845), (11, 1889265), (15, 1385461), (19, 1093785), (21, 989615), (33, 629755), (35, 593769), (55, 377853), (57, 364595), (77, 269895), (95, 218757), (105, 197923), (133, 156255), (165, 125951), (209, 99435), (231, 89965), (285, 72919), (385, 53979), (399, 52085), (627, 33145), (665, 31251), (947, 21945), (1045, 19887), (1155, 17993), (1463, 14205), (1995, 10417), (2841, 7315), (3135, 6629), (4389, 4735)]