21053879

素因数分解:

$7^2\times {\mathrm{11}}^2\times {\mathrm{53}}^1\times {\mathrm{67}}^1$

素因数の和:156

約数の個数: 36

約数和(自身を含む): 27837432

約数和(自身を除く): 6783553

約数列:

[1, 7, 11, 49, 53, 67, 77, 121, 371, 469, 539, 583, 737, 847, 2597, 3283, 3551, 4081, 5159, 5929, 6413, 8107, 24857, 28567, 36113, 39061, 44891, 56749, 173999, 273427, 314237, 397243, 429671, 1913989, 3007697, 21053879]

約数ペア:

[(1, 21053879), (7, 3007697), (11, 1913989), (49, 429671), (53, 397243), (67, 314237), (77, 273427), (121, 173999), (371, 56749), (469, 44891), (539, 39061), (583, 36113), (737, 28567), (847, 24857), (2597, 8107), (3283, 6413), (3551, 5929), (4081, 5159)]