20511265

素因数分解:

$5^1\times {\mathrm{17}}^1\times {\mathrm{29}}^1\times {\mathrm{53}}^1\times {\mathrm{157}}^1$

素因数の和:261

約数の個数: 32

約数和(自身を含む): 27643680

約数和(自身を除く): 7132415

約数列:

[1, 5, 17, 29, 53, 85, 145, 157, 265, 493, 785, 901, 1537, 2465, 2669, 4505, 4553, 7685, 8321, 13345, 22765, 26129, 41605, 77401, 130645, 141457, 241309, 387005, 707285, 1206545, 4102253, 20511265]

約数ペア:

[(1, 20511265), (5, 4102253), (17, 1206545), (29, 707285), (53, 387005), (85, 241309), (145, 141457), (157, 130645), (265, 77401), (493, 41605), (785, 26129), (901, 22765), (1537, 13345), (2465, 8321), (2669, 7685), (4505, 4553)]