990220

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{643}}^1$

素因数の和:670

約数の個数: 48

約数和(自身を含む): 2596608

約数和(自身を除く): 1606388

約数列:

[1, 2, 4, 5, 7, 10, 11, 14, 20, 22, 28, 35, 44, 55, 70, 77, 110, 140, 154, 220, 308, 385, 643, 770, 1286, 1540, 2572, 3215, 4501, 6430, 7073, 9002, 12860, 14146, 18004, 22505, 28292, 35365, 45010, 49511, 70730, 90020, 99022, 141460, 198044, 247555, 495110, 990220]

約数ペア:

[(1, 990220), (2, 495110), (4, 247555), (5, 198044), (7, 141460), (10, 99022), (11, 90020), (14, 70730), (20, 49511), (22, 45010), (28, 35365), (35, 28292), (44, 22505), (55, 18004), (70, 14146), (77, 12860), (110, 9002), (140, 7073), (154, 6430), (220, 4501), (308, 3215), (385, 2572), (643, 1540), (770, 1286)]