21411819

素因数分解:

$3^2\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{127}}^1\times {\mathrm{131}}^1$

素因数の和:288

約数の個数: 48

約数和(自身を含む): 36900864

約数和(自身を除く): 15489045

約数列:

[1, 3, 9, 11, 13, 33, 39, 99, 117, 127, 131, 143, 381, 393, 429, 1143, 1179, 1287, 1397, 1441, 1651, 1703, 4191, 4323, 4953, 5109, 12573, 12969, 14859, 15327, 16637, 18161, 18733, 49911, 54483, 56199, 149733, 163449, 168597, 183007, 216281, 549021, 648843, 1647063, 1946529, 2379091, 7137273, 21411819]

約数ペア:

[(1, 21411819), (3, 7137273), (9, 2379091), (11, 1946529), (13, 1647063), (33, 648843), (39, 549021), (99, 216281), (117, 183007), (127, 168597), (131, 163449), (143, 149733), (381, 56199), (393, 54483), (429, 49911), (1143, 18733), (1179, 18161), (1287, 16637), (1397, 15327), (1441, 14859), (1651, 12969), (1703, 12573), (4191, 5109), (4323, 4953)]