21509847

素因数分解:

$3^3\times {\mathrm{43}}^1\times {\mathrm{97}}^1\times {\mathrm{191}}^1$

素因数の和:340

約数の個数: 32

約数和(自身を含む): 33116160

約数和(自身を除く): 11606313

約数列:

[1, 3, 9, 27, 43, 97, 129, 191, 291, 387, 573, 873, 1161, 1719, 2619, 4171, 5157, 8213, 12513, 18527, 24639, 37539, 55581, 73917, 112617, 166743, 221751, 500229, 796661, 2389983, 7169949, 21509847]

約数ペア:

[(1, 21509847), (3, 7169949), (9, 2389983), (27, 796661), (43, 500229), (97, 221751), (129, 166743), (191, 112617), (291, 73917), (387, 55581), (573, 37539), (873, 24639), (1161, 18527), (1719, 12513), (2619, 8213), (4171, 5157)]