20871405

素因数分解:

$3^3\times 5^1\times {\mathrm{19}}^1\times {\mathrm{79}}^1\times {\mathrm{103}}^1$

素因数の和:215

約数の個数: 64

約数和(自身を含む): 39936000

約数和(自身を除く): 19064595

約数列:

[1, 3, 5, 9, 15, 19, 27, 45, 57, 79, 95, 103, 135, 171, 237, 285, 309, 395, 513, 515, 711, 855, 927, 1185, 1501, 1545, 1957, 2133, 2565, 2781, 3555, 4503, 4635, 5871, 7505, 8137, 9785, 10665, 13509, 13905, 17613, 22515, 24411, 29355, 40527, 40685, 52839, 67545, 73233, 88065, 122055, 154603, 202635, 219699, 264195, 366165, 463809, 773015, 1098495, 1391427, 2319045, 4174281, 6957135, 20871405]

約数ペア:

[(1, 20871405), (3, 6957135), (5, 4174281), (9, 2319045), (15, 1391427), (19, 1098495), (27, 773015), (45, 463809), (57, 366165), (79, 264195), (95, 219699), (103, 202635), (135, 154603), (171, 122055), (237, 88065), (285, 73233), (309, 67545), (395, 52839), (513, 40685), (515, 40527), (711, 29355), (855, 24411), (927, 22515), (1185, 17613), (1501, 13905), (1545, 13509), (1957, 10665), (2133, 9785), (2565, 8137), (2781, 7505), (3555, 5871), (4503, 4635)]