20998960

素因数分解:

$2^4\times 5^1\times {\mathrm{71}}^1\times {\mathrm{3697}}^1$

素因数の和:3781

約数の個数: 40

約数和(自身を含む): 49523616

約数和(自身を除く): 28524656

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 71, 80, 142, 284, 355, 568, 710, 1136, 1420, 2840, 3697, 5680, 7394, 14788, 18485, 29576, 36970, 59152, 73940, 147880, 262487, 295760, 524974, 1049948, 1312435, 2099896, 2624870, 4199792, 5249740, 10499480, 20998960]

約数ペア:

[(1, 20998960), (2, 10499480), (4, 5249740), (5, 4199792), (8, 2624870), (10, 2099896), (16, 1312435), (20, 1049948), (40, 524974), (71, 295760), (80, 262487), (142, 147880), (284, 73940), (355, 59152), (568, 36970), (710, 29576), (1136, 18485), (1420, 14788), (2840, 7394), (3697, 5680)]