20171781

素因数分解:

$3^3\times 7^2\times {\mathrm{79}}^1\times {\mathrm{193}}^1$

素因数の和:295

約数の個数: 48

約数和(自身を含む): 35385600

約数和(自身を除く): 15213819

約数列:

[1, 3, 7, 9, 21, 27, 49, 63, 79, 147, 189, 193, 237, 441, 553, 579, 711, 1323, 1351, 1659, 1737, 2133, 3871, 4053, 4977, 5211, 9457, 11613, 12159, 14931, 15247, 28371, 34839, 36477, 45741, 85113, 104517, 106729, 137223, 255339, 320187, 411669, 747103, 960561, 2241309, 2881683, 6723927, 20171781]

約数ペア:

[(1, 20171781), (3, 6723927), (7, 2881683), (9, 2241309), (21, 960561), (27, 747103), (49, 411669), (63, 320187), (79, 255339), (147, 137223), (189, 106729), (193, 104517), (237, 85113), (441, 45741), (553, 36477), (579, 34839), (711, 28371), (1323, 15247), (1351, 14931), (1659, 12159), (1737, 11613), (2133, 9457), (3871, 5211), (4053, 4977)]