21021280

素因数分解:

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

素因数の和:296

約数の個数: 72

約数和(自身を含む): 57174768

約数和(自身を除く): 36153488

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 32, 35, 40, 56, 70, 80, 112, 137, 140, 160, 224, 274, 280, 548, 560, 685, 959, 1096, 1120, 1370, 1918, 2192, 2740, 3836, 4384, 4795, 5480, 7672, 9590, 10960, 15344, 18769, 19180, 21920, 30688, 37538, 38360, 75076, 76720, 93845, 131383, 150152, 153440, 187690, 262766, 300304, 375380, 525532, 600608, 656915, 750760, 1051064, 1313830, 1501520, 2102128, 2627660, 3003040, 4204256, 5255320, 10510640, 21021280]

約数ペア:

[(1, 21021280), (2, 10510640), (4, 5255320), (5, 4204256), (7, 3003040), (8, 2627660), (10, 2102128), (14, 1501520), (16, 1313830), (20, 1051064), (28, 750760), (32, 656915), (35, 600608), (40, 525532), (56, 375380), (70, 300304), (80, 262766), (112, 187690), (137, 153440), (140, 150152), (160, 131383), (224, 93845), (274, 76720), (280, 75076), (548, 38360), (560, 37538), (685, 30688), (959, 21920), (1096, 19180), (1120, 18769), (1370, 15344), (1918, 10960), (2192, 9590), (2740, 7672), (3836, 5480), (4384, 4795)]