21006505

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{131}}^1\times {\mathrm{2467}}^1$

素因数の和:2616

約数の個数: 16

約数和(自身を含む): 27365184

約数和(自身を除く): 6358679

約数列:

[1, 5, 13, 65, 131, 655, 1703, 2467, 8515, 12335, 32071, 160355, 323177, 1615885, 4201301, 21006505]

約数ペア:

[(1, 21006505), (5, 4201301), (13, 1615885), (65, 323177), (131, 160355), (655, 32071), (1703, 12335), (2467, 8515)]