20916890

素因数分解:

$2^1\times 5^1\times {\mathrm{23}}^1\times {\mathrm{199}}^1\times {\mathrm{457}}^1$

素因数の和:686

約数の個数: 32

約数和(自身を含む): 39571200

約数和(自身を除く): 18654310

約数列:

[1, 2, 5, 10, 23, 46, 115, 199, 230, 398, 457, 914, 995, 1990, 2285, 4570, 4577, 9154, 10511, 21022, 22885, 45770, 52555, 90943, 105110, 181886, 454715, 909430, 2091689, 4183378, 10458445, 20916890]

約数ペア:

[(1, 20916890), (2, 10458445), (5, 4183378), (10, 2091689), (23, 909430), (46, 454715), (115, 181886), (199, 105110), (230, 90943), (398, 52555), (457, 45770), (914, 22885), (995, 21022), (1990, 10511), (2285, 9154), (4570, 4577)]