20991080

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^2\times {\mathrm{4337}}^1$

素因数の和:4370

約数の個数: 48

約数和(自身を含む): 51925860

約数和(自身を除く): 30934780

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 88, 110, 121, 220, 242, 440, 484, 605, 968, 1210, 2420, 4337, 4840, 8674, 17348, 21685, 34696, 43370, 47707, 86740, 95414, 173480, 190828, 238535, 381656, 477070, 524777, 954140, 1049554, 1908280, 2099108, 2623885, 4198216, 5247770, 10495540, 20991080]

約数ペア:

[(1, 20991080), (2, 10495540), (4, 5247770), (5, 4198216), (8, 2623885), (10, 2099108), (11, 1908280), (20, 1049554), (22, 954140), (40, 524777), (44, 477070), (55, 381656), (88, 238535), (110, 190828), (121, 173480), (220, 95414), (242, 86740), (440, 47707), (484, 43370), (605, 34696), (968, 21685), (1210, 17348), (2420, 8674), (4337, 4840)]