398080

素因数分解:

$2^8\times 5^1\times {\mathrm{311}}^1$

素因数の和:332

約数の個数: 36

約数和(自身を含む): 956592

約数和(自身を除く): 558512

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 311, 320, 622, 640, 1244, 1280, 1555, 2488, 3110, 4976, 6220, 9952, 12440, 19904, 24880, 39808, 49760, 79616, 99520, 199040, 398080]

約数ペア:

[(1, 398080), (2, 199040), (4, 99520), (5, 79616), (8, 49760), (10, 39808), (16, 24880), (20, 19904), (32, 12440), (40, 9952), (64, 6220), (80, 4976), (128, 3110), (160, 2488), (256, 1555), (311, 1280), (320, 1244), (622, 640)]