21194019

素因数分解:

$3^2\times 7^2\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{257}}^1$

素因数の和:305

約数の個数: 72

約数和(自身を含む): 41294448

約数和(自身を除く): 20100429

約数列:

[1, 3, 7, 9, 11, 17, 21, 33, 49, 51, 63, 77, 99, 119, 147, 153, 187, 231, 257, 357, 441, 539, 561, 693, 771, 833, 1071, 1309, 1617, 1683, 1799, 2313, 2499, 2827, 3927, 4369, 4851, 5397, 7497, 8481, 9163, 11781, 12593, 13107, 16191, 19789, 25443, 27489, 30583, 37779, 39321, 48059, 59367, 82467, 91749, 113337, 138523, 144177, 178101, 214081, 275247, 336413, 415569, 432531, 642243, 1009239, 1246707, 1926729, 2354891, 3027717, 7064673, 21194019]

約数ペア:

[(1, 21194019), (3, 7064673), (7, 3027717), (9, 2354891), (11, 1926729), (17, 1246707), (21, 1009239), (33, 642243), (49, 432531), (51, 415569), (63, 336413), (77, 275247), (99, 214081), (119, 178101), (147, 144177), (153, 138523), (187, 113337), (231, 91749), (257, 82467), (357, 59367), (441, 48059), (539, 39321), (561, 37779), (693, 30583), (771, 27489), (833, 25443), (1071, 19789), (1309, 16191), (1617, 13107), (1683, 12593), (1799, 11781), (2313, 9163), (2499, 8481), (2827, 7497), (3927, 5397), (4369, 4851)]