21491655

素因数分解:

$3^1\times 5^1\times {\mathrm{17}}^1\times {\mathrm{271}}^1\times {\mathrm{311}}^1$

素因数の和:607

約数の個数: 32

約数和(自身を含む): 36661248

約数和(自身を除く): 15169593

約数列:

[1, 3, 5, 15, 17, 51, 85, 255, 271, 311, 813, 933, 1355, 1555, 4065, 4607, 4665, 5287, 13821, 15861, 23035, 26435, 69105, 79305, 84281, 252843, 421405, 1264215, 1432777, 4298331, 7163885, 21491655]

約数ペア:

[(1, 21491655), (3, 7163885), (5, 4298331), (15, 1432777), (17, 1264215), (51, 421405), (85, 252843), (255, 84281), (271, 79305), (311, 69105), (813, 26435), (933, 23035), (1355, 15861), (1555, 13821), (4065, 5287), (4607, 4665)]