20178800

素因数分解:

$2^4\times 5^2\times {\mathrm{61}}^1\times {\mathrm{827}}^1$

素因数の和:906

約数の個数: 60

約数和(自身を含む): 49333896

約数和(自身を除く): 29155096

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 61, 80, 100, 122, 200, 244, 305, 400, 488, 610, 827, 976, 1220, 1525, 1654, 2440, 3050, 3308, 4135, 4880, 6100, 6616, 8270, 12200, 13232, 16540, 20675, 24400, 33080, 41350, 50447, 66160, 82700, 100894, 165400, 201788, 252235, 330800, 403576, 504470, 807152, 1008940, 1261175, 2017880, 2522350, 4035760, 5044700, 10089400, 20178800]

約数ペア:

[(1, 20178800), (2, 10089400), (4, 5044700), (5, 4035760), (8, 2522350), (10, 2017880), (16, 1261175), (20, 1008940), (25, 807152), (40, 504470), (50, 403576), (61, 330800), (80, 252235), (100, 201788), (122, 165400), (200, 100894), (244, 82700), (305, 66160), (400, 50447), (488, 41350), (610, 33080), (827, 24400), (976, 20675), (1220, 16540), (1525, 13232), (1654, 12200), (2440, 8270), (3050, 6616), (3308, 6100), (4135, 4880)]