19717025

素因数分解:

$5^2\times {\mathrm{17}}^2\times {\mathrm{2729}}^1$

素因数の和:2773

約数の個数: 18

約数和(自身を含む): 25981410

約数和(自身を除く): 6264385

約数列:

[1, 5, 17, 25, 85, 289, 425, 1445, 2729, 7225, 13645, 46393, 68225, 231965, 788681, 1159825, 3943405, 19717025]

約数ペア:

[(1, 19717025), (5, 3943405), (17, 1159825), (25, 788681), (85, 231965), (289, 68225), (425, 46393), (1445, 13645), (2729, 7225)]