20994500

素因数分解:

$2^2\times 5^3\times {\mathrm{199}}^1\times {\mathrm{211}}^1$

素因数の和:429

約数の個数: 48

約数和(自身を含む): 46300800

約数和(自身を除く): 25306300

約数列:

[1, 2, 4, 5, 10, 20, 25, 50, 100, 125, 199, 211, 250, 398, 422, 500, 796, 844, 995, 1055, 1990, 2110, 3980, 4220, 4975, 5275, 9950, 10550, 19900, 21100, 24875, 26375, 41989, 49750, 52750, 83978, 99500, 105500, 167956, 209945, 419890, 839780, 1049725, 2099450, 4198900, 5248625, 10497250, 20994500]

約数ペア:

[(1, 20994500), (2, 10497250), (4, 5248625), (5, 4198900), (10, 2099450), (20, 1049725), (25, 839780), (50, 419890), (100, 209945), (125, 167956), (199, 105500), (211, 99500), (250, 83978), (398, 52750), (422, 49750), (500, 41989), (796, 26375), (844, 24875), (995, 21100), (1055, 19900), (1990, 10550), (2110, 9950), (3980, 5275), (4220, 4975)]