20981289

素因数分解:

$3^1\times 7^1\times {\mathrm{127}}^1\times {\mathrm{7867}}^1$

素因数の和:8004

約数の個数: 16

約数和(自身を含む): 32227328

約数和(自身を除く): 11246039

約数列:

[1, 3, 7, 21, 127, 381, 889, 2667, 7867, 23601, 55069, 165207, 999109, 2997327, 6993763, 20981289]

約数ペア:

[(1, 20981289), (3, 6993763), (7, 2997327), (21, 999109), (127, 165207), (381, 55069), (889, 23601), (2667, 7867)]