21357729

素因数分解:

$3^3\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{79}}^1$

素因数の和:155

約数の個数: 64

約数和(自身を含む): 36864000

約数和(自身を除く): 15506271

約数列:

[1, 3, 9, 17, 19, 27, 31, 51, 57, 79, 93, 153, 171, 237, 279, 323, 459, 513, 527, 589, 711, 837, 969, 1343, 1501, 1581, 1767, 2133, 2449, 2907, 4029, 4503, 4743, 5301, 7347, 8721, 10013, 12087, 13509, 14229, 15903, 22041, 25517, 30039, 36261, 40527, 41633, 46531, 66123, 76551, 90117, 124899, 139593, 229653, 270351, 374697, 418779, 688959, 791027, 1124091, 1256337, 2373081, 7119243, 21357729]

約数ペア:

[(1, 21357729), (3, 7119243), (9, 2373081), (17, 1256337), (19, 1124091), (27, 791027), (31, 688959), (51, 418779), (57, 374697), (79, 270351), (93, 229653), (153, 139593), (171, 124899), (237, 90117), (279, 76551), (323, 66123), (459, 46531), (513, 41633), (527, 40527), (589, 36261), (711, 30039), (837, 25517), (969, 22041), (1343, 15903), (1501, 14229), (1581, 13509), (1767, 12087), (2133, 10013), (2449, 8721), (2907, 7347), (4029, 5301), (4503, 4743)]