20857215

素因数分解:

$3^1\times 5^1\times {\mathrm{17}}^1\times {\mathrm{263}}^1\times {\mathrm{311}}^1$

素因数の和:599

約数の個数: 32

約数和(自身を含む): 35582976

約数和(自身を除く): 14725761

約数列:

[1, 3, 5, 15, 17, 51, 85, 255, 263, 311, 789, 933, 1315, 1555, 3945, 4471, 4665, 5287, 13413, 15861, 22355, 26435, 67065, 79305, 81793, 245379, 408965, 1226895, 1390481, 4171443, 6952405, 20857215]

約数ペア:

[(1, 20857215), (3, 6952405), (5, 4171443), (15, 1390481), (17, 1226895), (51, 408965), (85, 245379), (255, 81793), (263, 79305), (311, 67065), (789, 26435), (933, 22355), (1315, 15861), (1555, 13413), (3945, 5287), (4471, 4665)]