81458660

素因数分解:

$2^2\times 5^1\times {\mathrm{97}}^1\times {\mathrm{199}}^1\times {\mathrm{211}}^1$

素因数の和:516

約数の個数: 48

約数和(自身を含む): 174518400

約数和(自身を除く): 93059740

約数列:

[1, 2, 4, 5, 10, 20, 97, 194, 199, 211, 388, 398, 422, 485, 796, 844, 970, 995, 1055, 1940, 1990, 2110, 3980, 4220, 19303, 20467, 38606, 40934, 41989, 77212, 81868, 83978, 96515, 102335, 167956, 193030, 204670, 209945, 386060, 409340, 419890, 839780, 4072933, 8145866, 16291732, 20364665, 40729330, 81458660]

約数ペア:

[(1, 81458660), (2, 40729330), (4, 20364665), (5, 16291732), (10, 8145866), (20, 4072933), (97, 839780), (194, 419890), (199, 409340), (211, 386060), (388, 209945), (398, 204670), (422, 193030), (485, 167956), (796, 102335), (844, 96515), (970, 83978), (995, 81868), (1055, 77212), (1940, 41989), (1990, 40934), (2110, 38606), (3980, 20467), (4220, 19303)]