256556720

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{23}}^1\times {\mathrm{19919}}^1$

素因数の和:19962

約数の個数: 80

約数和(自身を含む): 711383040

約数和(自身を除く): 454826320

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 23, 28, 35, 40, 46, 56, 70, 80, 92, 112, 115, 140, 161, 184, 230, 280, 322, 368, 460, 560, 644, 805, 920, 1288, 1610, 1840, 2576, 3220, 6440, 12880, 19919, 39838, 79676, 99595, 139433, 159352, 199190, 278866, 318704, 398380, 458137, 557732, 697165, 796760, 916274, 1115464, 1394330, 1593520, 1832548, 2230928, 2290685, 2788660, 3206959, 3665096, 4581370, 5577320, 6413918, 7330192, 9162740, 11154640, 12827836, 16034795, 18325480, 25655672, 32069590, 36650960, 51311344, 64139180, 128278360, 256556720]

約数ペア:

[(1, 256556720), (2, 128278360), (4, 64139180), (5, 51311344), (7, 36650960), (8, 32069590), (10, 25655672), (14, 18325480), (16, 16034795), (20, 12827836), (23, 11154640), (28, 9162740), (35, 7330192), (40, 6413918), (46, 5577320), (56, 4581370), (70, 3665096), (80, 3206959), (92, 2788660), (112, 2290685), (115, 2230928), (140, 1832548), (161, 1593520), (184, 1394330), (230, 1115464), (280, 916274), (322, 796760), (368, 697165), (460, 557732), (560, 458137), (644, 398380), (805, 318704), (920, 278866), (1288, 199190), (1610, 159352), (1840, 139433), (2576, 99595), (3220, 79676), (6440, 39838), (12880, 19919)]