21307727

素因数分解:

$7^1\times {\mathrm{61}}^1\times {\mathrm{139}}^1\times {\mathrm{359}}^1$

素因数の和:566

約数の個数: 16

約数和(自身を含む): 24998400

約数和(自身を除く): 3690673

約数列:

[1, 7, 61, 139, 359, 427, 973, 2513, 8479, 21899, 49901, 59353, 153293, 349307, 3043961, 21307727]

約数ペア:

[(1, 21307727), (7, 3043961), (61, 349307), (139, 153293), (359, 59353), (427, 49901), (973, 21899), (2513, 8479)]