19865979

素因数分解:

$3^6\times 7^1\times {\mathrm{17}}^1\times {\mathrm{229}}^1$

素因数の和:271

約数の個数: 56

約数和(自身を含む): 36200160

約数和(自身を除く): 16334181

約数列:

[1, 3, 7, 9, 17, 21, 27, 51, 63, 81, 119, 153, 189, 229, 243, 357, 459, 567, 687, 729, 1071, 1377, 1603, 1701, 2061, 3213, 3893, 4131, 4809, 5103, 6183, 9639, 11679, 12393, 14427, 18549, 27251, 28917, 35037, 43281, 55647, 81753, 86751, 105111, 129843, 166941, 245259, 315333, 389529, 735777, 945999, 1168587, 2207331, 2837997, 6621993, 19865979]

約数ペア:

[(1, 19865979), (3, 6621993), (7, 2837997), (9, 2207331), (17, 1168587), (21, 945999), (27, 735777), (51, 389529), (63, 315333), (81, 245259), (119, 166941), (153, 129843), (189, 105111), (229, 86751), (243, 81753), (357, 55647), (459, 43281), (567, 35037), (687, 28917), (729, 27251), (1071, 18549), (1377, 14427), (1603, 12393), (1701, 11679), (2061, 9639), (3213, 6183), (3893, 5103), (4131, 4809)]