21379787

素因数分解:

${\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{307}}^1\times {\mathrm{487}}^1$

素因数の和:818

約数の個数: 16

約数和(自身を含む): 25251072

約数和(自身を除く): 3871285

約数列:

[1, 11, 13, 143, 307, 487, 3377, 3991, 5357, 6331, 43901, 69641, 149509, 1644599, 1943617, 21379787]

約数ペア:

[(1, 21379787), (11, 1943617), (13, 1644599), (143, 149509), (307, 69641), (487, 43901), (3377, 6331), (3991, 5357)]