21002905

素因数分解:

$5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{3209}}^1$

素因数の和:3249

約数の個数: 32

約数和(自身を含む): 33281280

約数和(自身を除く): 12278375

約数列:

[1, 5, 7, 11, 17, 35, 55, 77, 85, 119, 187, 385, 595, 935, 1309, 3209, 6545, 16045, 22463, 35299, 54553, 112315, 176495, 247093, 272765, 381871, 600083, 1235465, 1909355, 3000415, 4200581, 21002905]

約数ペア:

[(1, 21002905), (5, 4200581), (7, 3000415), (11, 1909355), (17, 1235465), (35, 600083), (55, 381871), (77, 272765), (85, 247093), (119, 176495), (187, 112315), (385, 54553), (595, 35299), (935, 22463), (1309, 16045), (3209, 6545)]