638403950

素因数分解:

$2^1\times 5^2\times {\mathrm{641}}^1\times {\mathrm{19919}}^1$

素因数の和:20572

約数の個数: 24

約数和(自身を含む): 1189343520

約数和(自身を除く): 550939570

約数列:

[1, 2, 5, 10, 25, 50, 641, 1282, 3205, 6410, 16025, 19919, 32050, 39838, 99595, 199190, 497975, 995950, 12768079, 25536158, 63840395, 127680790, 319201975, 638403950]

約数ペア:

[(1, 638403950), (2, 319201975), (5, 127680790), (10, 63840395), (25, 25536158), (50, 12768079), (641, 995950), (1282, 497975), (3205, 199190), (6410, 99595), (16025, 39838), (19919, 32050)]