21297680

素因数分解:

$2^4\times 5^1\times {\mathrm{266221}}^1$

素因数の和:266234

約数の個数: 20

約数和(自身を含む): 49517292

約数和(自身を除く): 28219612

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 266221, 532442, 1064884, 1331105, 2129768, 2662210, 4259536, 5324420, 10648840, 21297680]

約数ペア:

[(1, 21297680), (2, 10648840), (4, 5324420), (5, 4259536), (8, 2662210), (10, 2129768), (16, 1331105), (20, 1064884), (40, 532442), (80, 266221)]