20991345

素因数分解:

$3^1\times 5^1\times {\mathrm{17}}^1\times {\mathrm{263}}^1\times {\mathrm{313}}^1$

素因数の和:601

約数の個数: 32

約数和(自身を含む): 35811072

約数和(自身を除く): 14819727

約数列:

[1, 3, 5, 15, 17, 51, 85, 255, 263, 313, 789, 939, 1315, 1565, 3945, 4471, 4695, 5321, 13413, 15963, 22355, 26605, 67065, 79815, 82319, 246957, 411595, 1234785, 1399423, 4198269, 6997115, 20991345]

約数ペア:

[(1, 20991345), (3, 6997115), (5, 4198269), (15, 1399423), (17, 1234785), (51, 411595), (85, 246957), (255, 82319), (263, 79815), (313, 67065), (789, 26605), (939, 22355), (1315, 15963), (1565, 13413), (3945, 5321), (4471, 4695)]