21000080

素因数分解:

$2^4\times 5^1\times {\mathrm{262501}}^1$

素因数の和:262514

約数の個数: 20

約数和(自身を含む): 48825372

約数和(自身を除く): 27825292

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 262501, 525002, 1050004, 1312505, 2100008, 2625010, 4200016, 5250020, 10500040, 21000080]

約数ペア:

[(1, 21000080), (2, 10500040), (4, 5250020), (5, 4200016), (8, 2625010), (10, 2100008), (16, 1312505), (20, 1050004), (40, 525002), (80, 262501)]