21002020

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{80777}}^1$

素因数の和:80799

約数の個数: 24

約数和(自身を含む): 47497464

約数和(自身を除く): 26495444

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 260, 80777, 161554, 323108, 403885, 807770, 1050101, 1615540, 2100202, 4200404, 5250505, 10501010, 21002020]

約数ペア:

[(1, 21002020), (2, 10501010), (4, 5250505), (5, 4200404), (10, 2100202), (13, 1615540), (20, 1050101), (26, 807770), (52, 403885), (65, 323108), (130, 161554), (260, 80777)]