9720405

素因数分解:

$3^4\times 5^1\times {\mathrm{24001}}^1$

素因数の和:24018

約数の個数: 20

約数和(自身を含む): 17425452

約数和(自身を除く): 7705047

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 405, 24001, 72003, 120005, 216009, 360015, 648027, 1080045, 1944081, 3240135, 9720405]

約数ペア:

[(1, 9720405), (3, 3240135), (5, 1944081), (9, 1080045), (15, 648027), (27, 360015), (45, 216009), (81, 120005), (135, 72003), (405, 24001)]