21000948995

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{29}}^1\times {\mathrm{383}}^1\times {\mathrm{1531}}^1$

素因数の和:1980

約数の個数: 64

約数和(自身を含む): 29649715200

約数和(自身を除く): 8648766205

約数列:

[1, 5, 13, 19, 29, 65, 95, 145, 247, 377, 383, 551, 1235, 1531, 1885, 1915, 2755, 4979, 7163, 7277, 7655, 11107, 19903, 24895, 29089, 35815, 36385, 44399, 55535, 94601, 99515, 144391, 145445, 211033, 221995, 378157, 473005, 577187, 586373, 721955, 843581, 1055165, 1890785, 2743429, 2885935, 2931865, 4217905, 7622849, 10966553, 11141087, 13717145, 17004817, 38114245, 54832765, 55705435, 85024085, 144834131, 221062621, 323091523, 724170655, 1105313105, 1615457615, 4200189799, 21000948995]

約数ペア:

[(1, 21000948995), (5, 4200189799), (13, 1615457615), (19, 1105313105), (29, 724170655), (65, 323091523), (95, 221062621), (145, 144834131), (247, 85024085), (377, 55705435), (383, 54832765), (551, 38114245), (1235, 17004817), (1531, 13717145), (1885, 11141087), (1915, 10966553), (2755, 7622849), (4979, 4217905), (7163, 2931865), (7277, 2885935), (7655, 2743429), (11107, 1890785), (19903, 1055165), (24895, 843581), (29089, 721955), (35815, 586373), (36385, 577187), (44399, 473005), (55535, 378157), (94601, 221995), (99515, 211033), (144391, 145445)]