20409520

素因数分解:

$2^4\times 5^1\times {\mathrm{17}}^1\times {\mathrm{43}}^1\times {\mathrm{349}}^1$

素因数の和:422

約数の個数: 80

約数和(自身を含む): 51559200

約数和(自身を除く): 31149680

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 34, 40, 43, 68, 80, 85, 86, 136, 170, 172, 215, 272, 340, 344, 349, 430, 680, 688, 698, 731, 860, 1360, 1396, 1462, 1720, 1745, 2792, 2924, 3440, 3490, 3655, 5584, 5848, 5933, 6980, 7310, 11696, 11866, 13960, 14620, 15007, 23732, 27920, 29240, 29665, 30014, 47464, 58480, 59330, 60028, 75035, 94928, 118660, 120056, 150070, 237320, 240112, 255119, 300140, 474640, 510238, 600280, 1020476, 1200560, 1275595, 2040952, 2551190, 4081904, 5102380, 10204760, 20409520]

約数ペア:

[(1, 20409520), (2, 10204760), (4, 5102380), (5, 4081904), (8, 2551190), (10, 2040952), (16, 1275595), (17, 1200560), (20, 1020476), (34, 600280), (40, 510238), (43, 474640), (68, 300140), (80, 255119), (85, 240112), (86, 237320), (136, 150070), (170, 120056), (172, 118660), (215, 94928), (272, 75035), (340, 60028), (344, 59330), (349, 58480), (430, 47464), (680, 30014), (688, 29665), (698, 29240), (731, 27920), (860, 23732), (1360, 15007), (1396, 14620), (1462, 13960), (1720, 11866), (1745, 11696), (2792, 7310), (2924, 6980), (3440, 5933), (3490, 5848), (3655, 5584)]