21991911

素因数分解:

$3^1\times {\mathrm{19}}^1\times {\mathrm{47}}^1\times {\mathrm{8209}}^1$

素因数の和:8278

約数の個数: 16

約数和(自身を含む): 31526400

約数和(自身を除く): 9534489

約数列:

[1, 3, 19, 47, 57, 141, 893, 2679, 8209, 24627, 155971, 385823, 467913, 1157469, 7330637, 21991911]

約数ペア:

[(1, 21991911), (3, 7330637), (19, 1157469), (47, 467913), (57, 385823), (141, 155971), (893, 24627), (2679, 8209)]