21263515

素因数分解:

$5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{2749}}^1$

素因数の和:2791

約数の個数: 32

約数和(自身を含む): 33264000

約数和(自身を除く): 12000485

約数列:

[1, 5, 7, 13, 17, 35, 65, 85, 91, 119, 221, 455, 595, 1105, 1547, 2749, 7735, 13745, 19243, 35737, 46733, 96215, 178685, 233665, 250159, 327131, 607529, 1250795, 1635655, 3037645, 4252703, 21263515]

約数ペア:

[(1, 21263515), (5, 4252703), (7, 3037645), (13, 1635655), (17, 1250795), (35, 607529), (65, 327131), (85, 250159), (91, 233665), (119, 178685), (221, 96215), (455, 46733), (595, 35737), (1105, 19243), (1547, 13745), (2749, 7735)]