777770920

素因数分解:

$2^3\times 5^1\times {\mathrm{71}}^1\times {\mathrm{137}}^1\times {\mathrm{1999}}^1$

素因数の和:2218

約数の個数: 64

約数和(自身を含む): 1788480000

約数和(自身を除く): 1010709080

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 71, 137, 142, 274, 284, 355, 548, 568, 685, 710, 1096, 1370, 1420, 1999, 2740, 2840, 3998, 5480, 7996, 9727, 9995, 15992, 19454, 19990, 38908, 39980, 48635, 77816, 79960, 97270, 141929, 194540, 273863, 283858, 389080, 547726, 567716, 709645, 1095452, 1135432, 1369315, 1419290, 2190904, 2738630, 2838580, 5477260, 5677160, 10954520, 19444273, 38888546, 77777092, 97221365, 155554184, 194442730, 388885460, 777770920]

約数ペア:

[(1, 777770920), (2, 388885460), (4, 194442730), (5, 155554184), (8, 97221365), (10, 77777092), (20, 38888546), (40, 19444273), (71, 10954520), (137, 5677160), (142, 5477260), (274, 2838580), (284, 2738630), (355, 2190904), (548, 1419290), (568, 1369315), (685, 1135432), (710, 1095452), (1096, 709645), (1370, 567716), (1420, 547726), (1999, 389080), (2740, 283858), (2840, 273863), (3998, 194540), (5480, 141929), (7996, 97270), (9727, 79960), (9995, 77816), (15992, 48635), (19454, 39980), (19990, 38908)]