20398840

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{37}}^1\times {\mathrm{179}}^1$

素因数の和:245

約数の個数: 128

約数和(自身を含む): 59097600

約数和(自身を除く): 38698760

約数列:

[1, 2, 4, 5, 7, 8, 10, 11, 14, 20, 22, 28, 35, 37, 40, 44, 55, 56, 70, 74, 77, 88, 110, 140, 148, 154, 179, 185, 220, 259, 280, 296, 308, 358, 370, 385, 407, 440, 518, 616, 716, 740, 770, 814, 895, 1036, 1253, 1295, 1432, 1480, 1540, 1628, 1790, 1969, 2035, 2072, 2506, 2590, 2849, 3080, 3256, 3580, 3938, 4070, 5012, 5180, 5698, 6265, 6623, 7160, 7876, 8140, 9845, 10024, 10360, 11396, 12530, 13246, 13783, 14245, 15752, 16280, 19690, 22792, 25060, 26492, 27566, 28490, 33115, 39380, 46361, 50120, 52984, 55132, 56980, 66230, 68915, 72853, 78760, 92722, 110264, 113960, 132460, 137830, 145706, 185444, 231805, 264920, 275660, 291412, 364265, 370888, 463610, 509971, 551320, 582824, 728530, 927220, 1019942, 1457060, 1854440, 2039884, 2549855, 2914120, 4079768, 5099710, 10199420, 20398840]

約数ペア:

[(1, 20398840), (2, 10199420), (4, 5099710), (5, 4079768), (7, 2914120), (8, 2549855), (10, 2039884), (11, 1854440), (14, 1457060), (20, 1019942), (22, 927220), (28, 728530), (35, 582824), (37, 551320), (40, 509971), (44, 463610), (55, 370888), (56, 364265), (70, 291412), (74, 275660), (77, 264920), (88, 231805), (110, 185444), (140, 145706), (148, 137830), (154, 132460), (179, 113960), (185, 110264), (220, 92722), (259, 78760), (280, 72853), (296, 68915), (308, 66230), (358, 56980), (370, 55132), (385, 52984), (407, 50120), (440, 46361), (518, 39380), (616, 33115), (716, 28490), (740, 27566), (770, 26492), (814, 25060), (895, 22792), (1036, 19690), (1253, 16280), (1295, 15752), (1432, 14245), (1480, 13783), (1540, 13246), (1628, 12530), (1790, 11396), (1969, 10360), (2035, 10024), (2072, 9845), (2506, 8140), (2590, 7876), (2849, 7160), (3080, 6623), (3256, 6265), (3580, 5698), (3938, 5180), (4070, 5012)]