21240970

素因数分解:

$2^1\times 5^1\times {\mathrm{401}}^1\times {\mathrm{5297}}^1$

素因数の和:5705

約数の個数: 16

約数和(自身を含む): 38336328

約数和(自身を除く): 17095358

約数列:

[1, 2, 5, 10, 401, 802, 2005, 4010, 5297, 10594, 26485, 52970, 2124097, 4248194, 10620485, 21240970]

約数ペア:

[(1, 21240970), (2, 10620485), (5, 4248194), (10, 2124097), (401, 52970), (802, 26485), (2005, 10594), (4010, 5297)]