20151131

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{41}}^1\times {\mathrm{491}}^1$

素因数の和:563

約数の個数: 32

約数和(自身を含む): 27772416

約数和(自身を除く): 7621285

約数列:

[1, 7, 11, 13, 41, 77, 91, 143, 287, 451, 491, 533, 1001, 3157, 3437, 3731, 5401, 5863, 6383, 20131, 37807, 41041, 44681, 70213, 140917, 221441, 261703, 491491, 1550087, 1831921, 2878733, 20151131]

約数ペア:

[(1, 20151131), (7, 2878733), (11, 1831921), (13, 1550087), (41, 491491), (77, 261703), (91, 221441), (143, 140917), (287, 70213), (451, 44681), (491, 41041), (533, 37807), (1001, 20131), (3157, 6383), (3437, 5863), (3731, 5401)]