21480080

素因数分解:

$2^4\times 5^1\times {\mathrm{268501}}^1$

素因数の和:268514

約数の個数: 20

約数和(自身を含む): 49941372

約数和(自身を除く): 28461292

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 268501, 537002, 1074004, 1342505, 2148008, 2685010, 4296016, 5370020, 10740040, 21480080]

約数ペア:

[(1, 21480080), (2, 10740040), (4, 5370020), (5, 4296016), (8, 2685010), (10, 2148008), (16, 1342505), (20, 1074004), (40, 537002), (80, 268501)]