21218225

素因数分解:

$5^2\times 7^2\times {\mathrm{17321}}^1$

素因数の和:17345

約数の個数: 18

約数和(自身を含む): 30607974

約数和(自身を除く): 9389749

約数列:

[1, 5, 7, 25, 35, 49, 175, 245, 1225, 17321, 86605, 121247, 433025, 606235, 848729, 3031175, 4243645, 21218225]

約数ペア:

[(1, 21218225), (5, 4243645), (7, 3031175), (25, 848729), (35, 606235), (49, 433025), (175, 121247), (245, 86605), (1225, 17321)]