43780

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{199}}^1$

素因数の和:219

約数の個数: 24

約数和(自身を含む): 100800

約数和(自身を除く): 57020

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 110, 199, 220, 398, 796, 995, 1990, 2189, 3980, 4378, 8756, 10945, 21890, 43780]

約数ペア:

[(1, 43780), (2, 21890), (4, 10945), (5, 8756), (10, 4378), (11, 3980), (20, 2189), (22, 1990), (44, 995), (55, 796), (110, 398), (199, 220)]