20912080

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{107}}^1\times {\mathrm{349}}^1$

素因数の和:476

約数の個数: 80

約数和(自身を含む): 56246400

約数和(自身を除く): 35334320

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 56, 70, 80, 107, 112, 140, 214, 280, 349, 428, 535, 560, 698, 749, 856, 1070, 1396, 1498, 1712, 1745, 2140, 2443, 2792, 2996, 3490, 3745, 4280, 4886, 5584, 5992, 6980, 7490, 8560, 9772, 11984, 12215, 13960, 14980, 19544, 24430, 27920, 29960, 37343, 39088, 48860, 59920, 74686, 97720, 149372, 186715, 195440, 261401, 298744, 373430, 522802, 597488, 746860, 1045604, 1307005, 1493720, 2091208, 2614010, 2987440, 4182416, 5228020, 10456040, 20912080]

約数ペア:

[(1, 20912080), (2, 10456040), (4, 5228020), (5, 4182416), (7, 2987440), (8, 2614010), (10, 2091208), (14, 1493720), (16, 1307005), (20, 1045604), (28, 746860), (35, 597488), (40, 522802), (56, 373430), (70, 298744), (80, 261401), (107, 195440), (112, 186715), (140, 149372), (214, 97720), (280, 74686), (349, 59920), (428, 48860), (535, 39088), (560, 37343), (698, 29960), (749, 27920), (856, 24430), (1070, 19544), (1396, 14980), (1498, 13960), (1712, 12215), (1745, 11984), (2140, 9772), (2443, 8560), (2792, 7490), (2996, 6980), (3490, 5992), (3745, 5584), (4280, 4886)]