20131111

素因数分解:

$7^2\times {\mathrm{11}}^1\times {\mathrm{13}}^3\times {\mathrm{17}}^1$

素因数の和:81

約数の個数: 48

約数和(自身を含む): 29302560

約数和(自身を除く): 9171449

約数列:

[1, 7, 11, 13, 17, 49, 77, 91, 119, 143, 169, 187, 221, 539, 637, 833, 1001, 1183, 1309, 1547, 1859, 2197, 2431, 2873, 7007, 8281, 9163, 10829, 13013, 15379, 17017, 20111, 24167, 31603, 37349, 91091, 107653, 119119, 140777, 169169, 221221, 261443, 410839, 1184183, 1548547, 1830101, 2875873, 20131111]

約数ペア:

[(1, 20131111), (7, 2875873), (11, 1830101), (13, 1548547), (17, 1184183), (49, 410839), (77, 261443), (91, 221221), (119, 169169), (143, 140777), (169, 119119), (187, 107653), (221, 91091), (539, 37349), (637, 31603), (833, 24167), (1001, 20111), (1183, 17017), (1309, 15379), (1547, 13013), (1859, 10829), (2197, 9163), (2431, 8281), (2873, 7007)]