21680015

素因数分解:

$5^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{83}}^1\times {\mathrm{439}}^1$

素因数の和:551

約数の個数: 32

約数和(自身を含む): 31933440

約数和(自身を除く): 10253425

約数列:

[1, 5, 7, 17, 35, 83, 85, 119, 415, 439, 581, 595, 1411, 2195, 2905, 3073, 7055, 7463, 9877, 15365, 36437, 37315, 49385, 52241, 182185, 255059, 261205, 619429, 1275295, 3097145, 4336003, 21680015]

約数ペア:

[(1, 21680015), (5, 4336003), (7, 3097145), (17, 1275295), (35, 619429), (83, 261205), (85, 255059), (119, 182185), (415, 52241), (439, 49385), (581, 37315), (595, 36437), (1411, 15365), (2195, 9877), (2905, 7463), (3073, 7055)]