18979280

素因数分解:

$2^4\times 5^1\times {\mathrm{131}}^1\times {\mathrm{1811}}^1$

素因数の和:1955

約数の個数: 40

約数和(自身を含む): 44488224

約数和(自身を除く): 25508944

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 131, 262, 524, 655, 1048, 1310, 1811, 2096, 2620, 3622, 5240, 7244, 9055, 10480, 14488, 18110, 28976, 36220, 72440, 144880, 237241, 474482, 948964, 1186205, 1897928, 2372410, 3795856, 4744820, 9489640, 18979280]

約数ペア:

[(1, 18979280), (2, 9489640), (4, 4744820), (5, 3795856), (8, 2372410), (10, 1897928), (16, 1186205), (20, 948964), (40, 474482), (80, 237241), (131, 144880), (262, 72440), (524, 36220), (655, 28976), (1048, 18110), (1310, 14488), (1811, 10480), (2096, 9055), (2620, 7244), (3622, 5240)]