21084921

素因数分解:

$3^3\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{127}}^1$

素因数の和:203

約数の個数: 64

約数和(自身を含む): 37847040

約数和(自身を除く): 16762119

約数列:

[1, 3, 9, 11, 13, 27, 33, 39, 43, 99, 117, 127, 129, 143, 297, 351, 381, 387, 429, 473, 559, 1143, 1161, 1287, 1397, 1419, 1651, 1677, 3429, 3861, 4191, 4257, 4953, 5031, 5461, 6149, 12573, 12771, 14859, 15093, 16383, 18161, 18447, 37719, 44577, 49149, 54483, 55341, 60071, 70993, 147447, 163449, 166023, 180213, 212979, 490347, 540639, 638937, 780923, 1621917, 1916811, 2342769, 7028307, 21084921]

約数ペア:

[(1, 21084921), (3, 7028307), (9, 2342769), (11, 1916811), (13, 1621917), (27, 780923), (33, 638937), (39, 540639), (43, 490347), (99, 212979), (117, 180213), (127, 166023), (129, 163449), (143, 147447), (297, 70993), (351, 60071), (381, 55341), (387, 54483), (429, 49149), (473, 44577), (559, 37719), (1143, 18447), (1161, 18161), (1287, 16383), (1397, 15093), (1419, 14859), (1651, 12771), (1677, 12573), (3429, 6149), (3861, 5461), (4191, 5031), (4257, 4953)]