21253799

素因数分解:

$7^2\times {\mathrm{19}}^1\times {\mathrm{37}}^1\times {\mathrm{617}}^1$

素因数の和:687

約数の個数: 24

約数和(自身を含む): 26771760

約数和(自身を除く): 5517961

約数列:

[1, 7, 19, 37, 49, 133, 259, 617, 703, 931, 1813, 4319, 4921, 11723, 22829, 30233, 34447, 82061, 159803, 433751, 574427, 1118621, 3036257, 21253799]

約数ペア:

[(1, 21253799), (7, 3036257), (19, 1118621), (37, 574427), (49, 433751), (133, 159803), (259, 82061), (617, 34447), (703, 30233), (931, 22829), (1813, 11723), (4319, 4921)]