21142745

素因数分解:

$5^1\times {\mathrm{13}}^2\times {\mathrm{131}}^1\times {\mathrm{191}}^1$

素因数の和:353

約数の個数: 24

約数和(自身を含む): 27827712

約数和(自身を除く): 6684967

約数列:

[1, 5, 13, 65, 131, 169, 191, 655, 845, 955, 1703, 2483, 8515, 12415, 22139, 25021, 32279, 110695, 125105, 161395, 325273, 1626365, 4228549, 21142745]

約数ペア:

[(1, 21142745), (5, 4228549), (13, 1626365), (65, 325273), (131, 161395), (169, 125105), (191, 110695), (655, 32279), (845, 25021), (955, 22139), (1703, 12415), (2483, 8515)]