21810295

素因数分解:

$5^1\times {\mathrm{13}}^2\times {\mathrm{53}}^1\times {\mathrm{487}}^1$

素因数の和:571

約数の個数: 24

約数和(自身を含む): 28934496

約数和(自身を除く): 7124201

約数列:

[1, 5, 13, 53, 65, 169, 265, 487, 689, 845, 2435, 3445, 6331, 8957, 25811, 31655, 44785, 82303, 129055, 335543, 411515, 1677715, 4362059, 21810295]

約数ペア:

[(1, 21810295), (5, 4362059), (13, 1677715), (53, 411515), (65, 335543), (169, 129055), (265, 82303), (487, 44785), (689, 31655), (845, 25811), (2435, 8957), (3445, 6331)]