20999503

素因数分解:

$7^1\times {\mathrm{19}}^1\times {\mathrm{41}}^1\times {\mathrm{3851}}^1$

素因数の和:3918

約数の個数: 16

約数和(自身を含む): 25885440

約数和(自身を除く): 4885937

約数列:

[1, 7, 19, 41, 133, 287, 779, 3851, 5453, 26957, 73169, 157891, 512183, 1105237, 2999929, 20999503]

約数ペア:

[(1, 20999503), (7, 2999929), (19, 1105237), (41, 512183), (133, 157891), (287, 73169), (779, 26957), (3851, 5453)]