641600

素因数分解:

$2^6\times 5^2\times {\mathrm{401}}^1$

素因数の和:423

約数の個数: 42

約数和(自身を含む): 1582674

約数和(自身を除く): 941074

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 160, 200, 320, 400, 401, 800, 802, 1600, 1604, 2005, 3208, 4010, 6416, 8020, 10025, 12832, 16040, 20050, 25664, 32080, 40100, 64160, 80200, 128320, 160400, 320800, 641600]

約数ペア:

[(1, 641600), (2, 320800), (4, 160400), (5, 128320), (8, 80200), (10, 64160), (16, 40100), (20, 32080), (25, 25664), (32, 20050), (40, 16040), (50, 12832), (64, 10025), (80, 8020), (100, 6416), (160, 4010), (200, 3208), (320, 2005), (400, 1604), (401, 1600), (800, 802)]