21989821

素因数分解:

$7^1\times {\mathrm{19}}^1\times {\mathrm{101}}^1\times {\mathrm{1637}}^1$

素因数の和:1764

約数の個数: 16

約数和(自身を含む): 26732160

約数和(自身を除く): 4742339

約数列:

[1, 7, 19, 101, 133, 707, 1637, 1919, 11459, 13433, 31103, 165337, 217721, 1157359, 3141403, 21989821]

約数ペア:

[(1, 21989821), (7, 3141403), (19, 1157359), (101, 217721), (133, 165337), (707, 31103), (1637, 13433), (1919, 11459)]