1990991575

素因数分解:

$5^2\times {\mathrm{79}}^1\times {\mathrm{157}}^1\times {\mathrm{6421}}^1$

素因数の和:6667

約数の個数: 24

約数和(自身を含む): 2516396480

約数和(自身を除く): 525404905

約数列:

[1, 5, 25, 79, 157, 395, 785, 1975, 3925, 6421, 12403, 32105, 62015, 160525, 310075, 507259, 1008097, 2536295, 5040485, 12681475, 25202425, 79639663, 398198315, 1990991575]

約数ペア:

[(1, 1990991575), (5, 398198315), (25, 79639663), (79, 25202425), (157, 12681475), (395, 5040485), (785, 2536295), (1975, 1008097), (3925, 507259), (6421, 310075), (12403, 160525), (32105, 62015)]