8420425

素因数分解:

$5^2\times {\mathrm{13}}^2\times {\mathrm{1993}}^1$

素因数の和:2029

約数の個数: 18

約数和(自身を含む): 11311962

約数和(自身を除く): 2891537

約数列:

[1, 5, 13, 25, 65, 169, 325, 845, 1993, 4225, 9965, 25909, 49825, 129545, 336817, 647725, 1684085, 8420425]

約数ペア:

[(1, 8420425), (5, 1684085), (13, 647725), (25, 336817), (65, 129545), (169, 49825), (325, 25909), (845, 9965), (1993, 4225)]