21784581

素因数分解:

$3^2\times 7^1\times {\mathrm{13}}^1\times {\mathrm{67}}^1\times {\mathrm{397}}^1$

素因数の和:490

約数の個数: 48

約数和(自身を含む): 39405184

約数和(自身を除く): 17620603

約数列:

[1, 3, 7, 9, 13, 21, 39, 63, 67, 91, 117, 201, 273, 397, 469, 603, 819, 871, 1191, 1407, 2613, 2779, 3573, 4221, 5161, 6097, 7839, 8337, 15483, 18291, 25011, 26599, 36127, 46449, 54873, 79797, 108381, 186193, 239391, 325143, 345787, 558579, 1037361, 1675737, 2420509, 3112083, 7261527, 21784581]

約数ペア:

[(1, 21784581), (3, 7261527), (7, 3112083), (9, 2420509), (13, 1675737), (21, 1037361), (39, 558579), (63, 345787), (67, 325143), (91, 239391), (117, 186193), (201, 108381), (273, 79797), (397, 54873), (469, 46449), (603, 36127), (819, 26599), (871, 25011), (1191, 18291), (1407, 15483), (2613, 8337), (2779, 7839), (3573, 6097), (4221, 5161)]