20871305

素因数分解:

$5^1\times 7^2\times {\mathrm{13}}^1\times {\mathrm{6553}}^1$

素因数の和:6585

約数の個数: 24

約数和(自身を含む): 31380552

約数和(自身を除く): 10509247

約数列:

[1, 5, 7, 13, 35, 49, 65, 91, 245, 455, 637, 3185, 6553, 32765, 45871, 85189, 229355, 321097, 425945, 596323, 1605485, 2981615, 4174261, 20871305]

約数ペア:

[(1, 20871305), (5, 4174261), (7, 2981615), (13, 1605485), (35, 596323), (49, 425945), (65, 321097), (91, 229355), (245, 85189), (455, 45871), (637, 32765), (3185, 6553)]