20178880025

素因数分解:

$5^2\times {\mathrm{149}}^1\times {\mathrm{173}}^2\times {\mathrm{181}}^1$

素因数の和:686

約数の個数: 36

約数和(自身を含む): 25476168900

約数和(自身を除く): 5297288875

約数列:

[1, 5, 25, 149, 173, 181, 745, 865, 905, 3725, 4325, 4525, 25777, 26969, 29929, 31313, 128885, 134845, 149645, 156565, 644425, 674225, 748225, 782825, 4459421, 4665637, 5417149, 22297105, 23328185, 27085745, 111485525, 116640925, 135428725, 807155201, 4035776005, 20178880025]

約数ペア:

[(1, 20178880025), (5, 4035776005), (25, 807155201), (149, 135428725), (173, 116640925), (181, 111485525), (745, 27085745), (865, 23328185), (905, 22297105), (3725, 5417149), (4325, 4665637), (4525, 4459421), (25777, 782825), (26969, 748225), (29929, 674225), (31313, 644425), (128885, 156565), (134845, 149645)]