20491982080

素因数分解:

$2^8\times 5^1\times {\mathrm{31}}^1\times {\mathrm{516431}}^1$

素因数の和:516483

約数の個数: 72

約数和(自身を含む): 50668176384

約数和(自身を除く): 30176194304

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 32, 40, 62, 64, 80, 124, 128, 155, 160, 248, 256, 310, 320, 496, 620, 640, 992, 1240, 1280, 1984, 2480, 3968, 4960, 7936, 9920, 19840, 39680, 516431, 1032862, 2065724, 2582155, 4131448, 5164310, 8262896, 10328620, 16009361, 16525792, 20657240, 32018722, 33051584, 41314480, 64037444, 66103168, 80046805, 82628960, 128074888, 132206336, 160093610, 165257920, 256149776, 320187220, 330515840, 512299552, 640374440, 661031680, 1024599104, 1280748880, 2049198208, 2561497760, 4098396416, 5122995520, 10245991040, 20491982080]

約数ペア:

[(1, 20491982080), (2, 10245991040), (4, 5122995520), (5, 4098396416), (8, 2561497760), (10, 2049198208), (16, 1280748880), (20, 1024599104), (31, 661031680), (32, 640374440), (40, 512299552), (62, 330515840), (64, 320187220), (80, 256149776), (124, 165257920), (128, 160093610), (155, 132206336), (160, 128074888), (248, 82628960), (256, 80046805), (310, 66103168), (320, 64037444), (496, 41314480), (620, 33051584), (640, 32018722), (992, 20657240), (1240, 16525792), (1280, 16009361), (1984, 10328620), (2480, 8262896), (3968, 5164310), (4960, 4131448), (7936, 2582155), (9920, 2065724), (19840, 1032862), (39680, 516431)]