20001555

素因数分解:

$3^2\times 5^1\times 7^2\times {\mathrm{47}}^1\times {\mathrm{193}}^1$

素因数の和:265

約数の個数: 72

約数和(自身を含む): 41401152

約数和(自身を除く): 21399597

約数列:

[1, 3, 5, 7, 9, 15, 21, 35, 45, 47, 49, 63, 105, 141, 147, 193, 235, 245, 315, 329, 423, 441, 579, 705, 735, 965, 987, 1351, 1645, 1737, 2115, 2205, 2303, 2895, 2961, 4053, 4935, 6755, 6909, 8685, 9071, 9457, 11515, 12159, 14805, 20265, 20727, 27213, 28371, 34545, 45355, 47285, 60795, 63497, 81639, 85113, 103635, 136065, 141855, 190491, 317485, 408195, 425565, 444479, 571473, 952455, 1333437, 2222395, 2857365, 4000311, 6667185, 20001555]

約数ペア:

[(1, 20001555), (3, 6667185), (5, 4000311), (7, 2857365), (9, 2222395), (15, 1333437), (21, 952455), (35, 571473), (45, 444479), (47, 425565), (49, 408195), (63, 317485), (105, 190491), (141, 141855), (147, 136065), (193, 103635), (235, 85113), (245, 81639), (315, 63497), (329, 60795), (423, 47285), (441, 45355), (579, 34545), (705, 28371), (735, 27213), (965, 20727), (987, 20265), (1351, 14805), (1645, 12159), (1737, 11515), (2115, 9457), (2205, 9071), (2303, 8685), (2895, 6909), (2961, 6755), (4053, 4935)]