21091707

素因数分解:

$3^2\times 7^2\times {\mathrm{13}}^2\times {\mathrm{283}}^1$

素因数の和:329

約数の個数: 54

約数和(自身を含む): 38511252

約数和(自身を除く): 17419545

約数列:

[1, 3, 7, 9, 13, 21, 39, 49, 63, 91, 117, 147, 169, 273, 283, 441, 507, 637, 819, 849, 1183, 1521, 1911, 1981, 2547, 3549, 3679, 5733, 5943, 8281, 10647, 11037, 13867, 17829, 24843, 25753, 33111, 41601, 47827, 74529, 77259, 124803, 143481, 180271, 231777, 334789, 430443, 540813, 1004367, 1622439, 2343523, 3013101, 7030569, 21091707]

約数ペア:

[(1, 21091707), (3, 7030569), (7, 3013101), (9, 2343523), (13, 1622439), (21, 1004367), (39, 540813), (49, 430443), (63, 334789), (91, 231777), (117, 180271), (147, 143481), (169, 124803), (273, 77259), (283, 74529), (441, 47827), (507, 41601), (637, 33111), (819, 25753), (849, 24843), (1183, 17829), (1521, 13867), (1911, 11037), (1981, 10647), (2547, 8281), (3549, 5943), (3679, 5733)]