21780327

素因数分解:

$3^1\times {\mathrm{19}}^1\times {\mathrm{139}}^1\times {\mathrm{2749}}^1$

素因数の和:2910

約数の個数: 16

約数和(自身を含む): 30800000

約数和(自身を除く): 9019673

約数列:

[1, 3, 19, 57, 139, 417, 2641, 2749, 7923, 8247, 52231, 156693, 382111, 1146333, 7260109, 21780327]

約数ペア:

[(1, 21780327), (3, 7260109), (19, 1146333), (57, 382111), (139, 156693), (417, 52231), (2641, 8247), (2749, 7923)]