20688400

素因数分解:

$2^4\times 5^2\times {\mathrm{51721}}^1$

素因数の和:51739

約数の個数: 30

約数和(自身を含む): 49704842

約数和(自身を除く): 29016442

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 400, 51721, 103442, 206884, 258605, 413768, 517210, 827536, 1034420, 1293025, 2068840, 2586050, 4137680, 5172100, 10344200, 20688400]

約数ペア:

[(1, 20688400), (2, 10344200), (4, 5172100), (5, 4137680), (8, 2586050), (10, 2068840), (16, 1293025), (20, 1034420), (25, 827536), (40, 517210), (50, 413768), (80, 258605), (100, 206884), (200, 103442), (400, 51721)]