20728225

素因数分解:

$5^2\times 7^2\times {\mathrm{16921}}^1$

素因数の和:16945

約数の個数: 18

約数和(自身を含む): 29901174

約数和(自身を除く): 9172949

約数列:

[1, 5, 7, 25, 35, 49, 175, 245, 1225, 16921, 84605, 118447, 423025, 592235, 829129, 2961175, 4145645, 20728225]

約数ペア:

[(1, 20728225), (5, 4145645), (7, 2961175), (25, 829129), (35, 592235), (49, 423025), (175, 118447), (245, 84605), (1225, 16921)]