19901987

素因数分解:

$7^2\times {\mathrm{19}}^1\times {\mathrm{21377}}^1$

素因数の和:21410

約数の個数: 12

約数和(自身を含む): 24370920

約数和(自身を除く): 4468933

約数列:

[1, 7, 19, 49, 133, 931, 21377, 149639, 406163, 1047473, 2843141, 19901987]

約数ペア:

[(1, 19901987), (7, 2843141), (19, 1047473), (49, 406163), (133, 149639), (931, 21377)]