21052920

素因数分解:

$2^3\times 3^1\times 5^1\times 7^1\times {\mathrm{71}}^1\times {\mathrm{353}}^1$

素因数の和:445

約数の個数: 128

約数和(自身を含む): 73405440

約数和(自身を除く): 52352520

約数列:

[1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 20, 21, 24, 28, 30, 35, 40, 42, 56, 60, 70, 71, 84, 105, 120, 140, 142, 168, 210, 213, 280, 284, 353, 355, 420, 426, 497, 568, 706, 710, 840, 852, 994, 1059, 1065, 1412, 1420, 1491, 1704, 1765, 1988, 2118, 2130, 2471, 2485, 2824, 2840, 2982, 3530, 3976, 4236, 4260, 4942, 4970, 5295, 5964, 7060, 7413, 7455, 8472, 8520, 9884, 9940, 10590, 11928, 12355, 14120, 14826, 14910, 19768, 19880, 21180, 24710, 25063, 29652, 29820, 37065, 42360, 49420, 50126, 59304, 59640, 74130, 75189, 98840, 100252, 125315, 148260, 150378, 175441, 200504, 250630, 296520, 300756, 350882, 375945, 501260, 526323, 601512, 701764, 751890, 877205, 1002520, 1052646, 1403528, 1503780, 1754410, 2105292, 2631615, 3007560, 3508820, 4210584, 5263230, 7017640, 10526460, 21052920]

約数ペア:

[(1, 21052920), (2, 10526460), (3, 7017640), (4, 5263230), (5, 4210584), (6, 3508820), (7, 3007560), (8, 2631615), (10, 2105292), (12, 1754410), (14, 1503780), (15, 1403528), (20, 1052646), (21, 1002520), (24, 877205), (28, 751890), (30, 701764), (35, 601512), (40, 526323), (42, 501260), (56, 375945), (60, 350882), (70, 300756), (71, 296520), (84, 250630), (105, 200504), (120, 175441), (140, 150378), (142, 148260), (168, 125315), (210, 100252), (213, 98840), (280, 75189), (284, 74130), (353, 59640), (355, 59304), (420, 50126), (426, 49420), (497, 42360), (568, 37065), (706, 29820), (710, 29652), (840, 25063), (852, 24710), (994, 21180), (1059, 19880), (1065, 19768), (1412, 14910), (1420, 14826), (1491, 14120), (1704, 12355), (1765, 11928), (1988, 10590), (2118, 9940), (2130, 9884), (2471, 8520), (2485, 8472), (2824, 7455), (2840, 7413), (2982, 7060), (3530, 5964), (3976, 5295), (4236, 4970), (4260, 4942)]