21178235

素因数分解:

$5^1\times {\mathrm{13}}^2\times {\mathrm{71}}^1\times {\mathrm{353}}^1$

素因数の和:455

約数の個数: 24

約数和(自身を含む): 27985824

約数和(自身を除く): 6807589

約数列:

[1, 5, 13, 65, 71, 169, 353, 355, 845, 923, 1765, 4589, 4615, 11999, 22945, 25063, 59657, 59995, 125315, 298285, 325819, 1629095, 4235647, 21178235]

約数ペア:

[(1, 21178235), (5, 4235647), (13, 1629095), (65, 325819), (71, 298285), (169, 125315), (353, 59995), (355, 59657), (845, 25063), (923, 22945), (1765, 11999), (4589, 4615)]