212920981

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{53}}^1\times {\mathrm{131}}^1\times {\mathrm{337}}^1$

素因数の和:541

約数の個数: 32

約数和(自身を含む): 269837568

約数和(自身を除く): 56916587

約数列:

[1, 7, 13, 53, 91, 131, 337, 371, 689, 917, 1703, 2359, 4381, 4823, 6943, 11921, 17861, 30667, 44147, 48601, 90259, 125027, 232193, 309029, 573911, 631813, 1625351, 2339791, 4017377, 16378537, 30417283, 212920981]

約数ペア:

[(1, 212920981), (7, 30417283), (13, 16378537), (53, 4017377), (91, 2339791), (131, 1625351), (337, 631813), (371, 573911), (689, 309029), (917, 232193), (1703, 125027), (2359, 90259), (4381, 48601), (4823, 44147), (6943, 30667), (11921, 17861)]