21366520

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{137}}^1\times {\mathrm{557}}^1$

素因数の和:712

約数の個数: 64

約数和(自身を含む): 55442880

約数和(自身を除く): 34076360

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 137, 140, 274, 280, 548, 557, 685, 959, 1096, 1114, 1370, 1918, 2228, 2740, 2785, 3836, 3899, 4456, 4795, 5480, 5570, 7672, 7798, 9590, 11140, 15596, 19180, 19495, 22280, 31192, 38360, 38990, 76309, 77980, 152618, 155960, 305236, 381545, 534163, 610472, 763090, 1068326, 1526180, 2136652, 2670815, 3052360, 4273304, 5341630, 10683260, 21366520]

約数ペア:

[(1, 21366520), (2, 10683260), (4, 5341630), (5, 4273304), (7, 3052360), (8, 2670815), (10, 2136652), (14, 1526180), (20, 1068326), (28, 763090), (35, 610472), (40, 534163), (56, 381545), (70, 305236), (137, 155960), (140, 152618), (274, 77980), (280, 76309), (548, 38990), (557, 38360), (685, 31192), (959, 22280), (1096, 19495), (1114, 19180), (1370, 15596), (1918, 11140), (2228, 9590), (2740, 7798), (2785, 7672), (3836, 5570), (3899, 5480), (4456, 4795)]