21018205

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{827}}^1$

素因数の和:885

約数の個数: 32

約数和(自身を含む): 30046464

約数和(自身を除く): 9028259

約数列:

[1, 5, 13, 17, 23, 65, 85, 115, 221, 299, 391, 827, 1105, 1495, 1955, 4135, 5083, 10751, 14059, 19021, 25415, 53755, 70295, 95105, 182767, 247273, 323357, 913835, 1236365, 1616785, 4203641, 21018205]

約数ペア:

[(1, 21018205), (5, 4203641), (13, 1616785), (17, 1236365), (23, 913835), (65, 323357), (85, 247273), (115, 182767), (221, 95105), (299, 70295), (391, 53755), (827, 25415), (1105, 19021), (1495, 14059), (1955, 10751), (4135, 5083)]