20990121

素因数分解:

$3^1\times {\mathrm{17}}^1\times {\mathrm{97}}^1\times {\mathrm{4243}}^1$

素因数の和:4360

約数の個数: 16

約数和(自身を含む): 29945664

約数和(自身を除く): 8955543

約数列:

[1, 3, 17, 51, 97, 291, 1649, 4243, 4947, 12729, 72131, 216393, 411571, 1234713, 6996707, 20990121]

約数ペア:

[(1, 20990121), (3, 6996707), (17, 1234713), (51, 411571), (97, 216393), (291, 72131), (1649, 12729), (4243, 4947)]