21151921

素因数分解:

$7^1\times {\mathrm{19}}^1\times {\mathrm{359}}^1\times {\mathrm{443}}^1$

素因数の和:828

約数の個数: 16

約数和(自身を含む): 25574400

約数和(自身を除く): 4422479

約数列:

[1, 7, 19, 133, 359, 443, 2513, 3101, 6821, 8417, 47747, 58919, 159037, 1113259, 3021703, 21151921]

約数ペア:

[(1, 21151921), (7, 3021703), (19, 1113259), (133, 159037), (359, 58919), (443, 47747), (2513, 8417), (3101, 6821)]