21539745

素因数分解:

$3^2\times 5^1\times {\mathrm{73}}^1\times {\mathrm{79}}^1\times {\mathrm{83}}^1$

素因数の和:246

約数の個数: 48

約数和(自身を含む): 38787840

約数和(自身を除く): 17248095

約数列:

[1, 3, 5, 9, 15, 45, 73, 79, 83, 219, 237, 249, 365, 395, 415, 657, 711, 747, 1095, 1185, 1245, 3285, 3555, 3735, 5767, 6059, 6557, 17301, 18177, 19671, 28835, 30295, 32785, 51903, 54531, 59013, 86505, 90885, 98355, 259515, 272655, 295065, 478661, 1435983, 2393305, 4307949, 7179915, 21539745]

約数ペア:

[(1, 21539745), (3, 7179915), (5, 4307949), (9, 2393305), (15, 1435983), (45, 478661), (73, 295065), (79, 272655), (83, 259515), (219, 98355), (237, 90885), (249, 86505), (365, 59013), (395, 54531), (415, 51903), (657, 32785), (711, 30295), (747, 28835), (1095, 19671), (1185, 18177), (1245, 17301), (3285, 6557), (3555, 6059), (3735, 5767)]