21900879

素因数分解:

$3^2\times 7^1\times {\mathrm{11}}^2\times {\mathrm{13}}^2\times {\mathrm{17}}^1$

素因数の和:78

約数の個数: 108

約数和(自身を含む): 45562608

約数和(自身を除く): 23661729

約数列:

[1, 3, 7, 9, 11, 13, 17, 21, 33, 39, 51, 63, 77, 91, 99, 117, 119, 121, 143, 153, 169, 187, 221, 231, 273, 357, 363, 429, 507, 561, 663, 693, 819, 847, 1001, 1071, 1089, 1183, 1287, 1309, 1521, 1547, 1573, 1683, 1859, 1989, 2057, 2431, 2541, 2873, 3003, 3549, 3927, 4641, 4719, 5577, 6171, 7293, 7623, 8619, 9009, 10647, 11011, 11781, 13013, 13923, 14157, 14399, 16731, 17017, 18513, 20111, 20449, 21879, 25857, 26741, 31603, 33033, 39039, 43197, 51051, 60333, 61347, 80223, 94809, 99099, 117117, 129591, 143143, 153153, 180999, 184041, 187187, 221221, 240669, 284427, 347633, 429429, 561561, 663663, 1042899, 1288287, 1684683, 1990989, 2433431, 3128697, 7300293, 21900879]

約数ペア:

[(1, 21900879), (3, 7300293), (7, 3128697), (9, 2433431), (11, 1990989), (13, 1684683), (17, 1288287), (21, 1042899), (33, 663663), (39, 561561), (51, 429429), (63, 347633), (77, 284427), (91, 240669), (99, 221221), (117, 187187), (119, 184041), (121, 180999), (143, 153153), (153, 143143), (169, 129591), (187, 117117), (221, 99099), (231, 94809), (273, 80223), (357, 61347), (363, 60333), (429, 51051), (507, 43197), (561, 39039), (663, 33033), (693, 31603), (819, 26741), (847, 25857), (1001, 21879), (1071, 20449), (1089, 20111), (1183, 18513), (1287, 17017), (1309, 16731), (1521, 14399), (1547, 14157), (1573, 13923), (1683, 13013), (1859, 11781), (1989, 11011), (2057, 10647), (2431, 9009), (2541, 8619), (2873, 7623), (3003, 7293), (3549, 6171), (3927, 5577), (4641, 4719)]