9981880

素因数分解:

$2^3\times 5^1\times {\mathrm{257}}^1\times {\mathrm{971}}^1$

素因数の和:1239

約数の個数: 32

約数和(自身を含む): 22569840

約数和(自身を除く): 12587960

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 257, 514, 971, 1028, 1285, 1942, 2056, 2570, 3884, 4855, 5140, 7768, 9710, 10280, 19420, 38840, 249547, 499094, 998188, 1247735, 1996376, 2495470, 4990940, 9981880]

約数ペア:

[(1, 9981880), (2, 4990940), (4, 2495470), (5, 1996376), (8, 1247735), (10, 998188), (20, 499094), (40, 249547), (257, 38840), (514, 19420), (971, 10280), (1028, 9710), (1285, 7768), (1942, 5140), (2056, 4855), (2570, 3884)]