19808080

素因数分解:

$2^4\times 5^1\times {\mathrm{247601}}^1$

素因数の和:247614

約数の個数: 20

約数和(自身を含む): 46053972

約数和(自身を除く): 26245892

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 247601, 495202, 990404, 1238005, 1980808, 2476010, 3961616, 4952020, 9904040, 19808080]

約数ペア:

[(1, 19808080), (2, 9904040), (4, 4952020), (5, 3961616), (8, 2476010), (10, 1980808), (16, 1238005), (20, 990404), (40, 495202), (80, 247601)]