20915181

素因数分解:

$3^2\times 7^1\times {\mathrm{19}}^1\times {\mathrm{101}}^1\times {\mathrm{173}}^1$

素因数の和:306

約数の個数: 48

約数和(自身を含む): 36915840

約数和(自身を除く): 16000659

約数列:

[1, 3, 7, 9, 19, 21, 57, 63, 101, 133, 171, 173, 303, 399, 519, 707, 909, 1197, 1211, 1557, 1919, 2121, 3287, 3633, 5757, 6363, 9861, 10899, 13433, 17271, 17473, 23009, 29583, 40299, 52419, 69027, 120897, 122311, 157257, 207081, 331987, 366933, 995961, 1100799, 2323909, 2987883, 6971727, 20915181]

約数ペア:

[(1, 20915181), (3, 6971727), (7, 2987883), (9, 2323909), (19, 1100799), (21, 995961), (57, 366933), (63, 331987), (101, 207081), (133, 157257), (171, 122311), (173, 120897), (303, 69027), (399, 52419), (519, 40299), (707, 29583), (909, 23009), (1197, 17473), (1211, 17271), (1557, 13433), (1919, 10899), (2121, 9861), (3287, 6363), (3633, 5757)]