21502789

素因数分解:

$7^1\times {\mathrm{11}}^2\times {\mathrm{53}}^1\times {\mathrm{479}}^1$

素因数の和:561

約数の個数: 24

約数和(自身を含む): 27578880

約数和(自身を除く): 6076091

約数列:

[1, 7, 11, 53, 77, 121, 371, 479, 583, 847, 3353, 4081, 5269, 6413, 25387, 36883, 44891, 57959, 177709, 279257, 405713, 1954799, 3071827, 21502789]

約数ペア:

[(1, 21502789), (7, 3071827), (11, 1954799), (53, 405713), (77, 279257), (121, 177709), (371, 57959), (479, 44891), (583, 36883), (847, 25387), (3353, 6413), (4081, 5269)]