21691221

素因数分解:

$3^1\times {\mathrm{43}}^1\times {\mathrm{181}}^1\times {\mathrm{929}}^1$

素因数の和:1156

約数の個数: 16

約数和(自身を含む): 29789760

約数和(自身を除く): 8098539

約数列:

[1, 3, 43, 129, 181, 543, 929, 2787, 7783, 23349, 39947, 119841, 168149, 504447, 7230407, 21691221]

約数ペア:

[(1, 21691221), (3, 7230407), (43, 504447), (129, 168149), (181, 119841), (543, 39947), (929, 23349), (2787, 7783)]