21305420

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{223}}^1\times {\mathrm{281}}^1$

素因数の和:530

約数の個数: 48

約数和(自身を含む): 47755008

約数和(自身を除く): 26449588

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 170, 223, 281, 340, 446, 562, 892, 1115, 1124, 1405, 2230, 2810, 3791, 4460, 4777, 5620, 7582, 9554, 15164, 18955, 19108, 23885, 37910, 47770, 62663, 75820, 95540, 125326, 250652, 313315, 626630, 1065271, 1253260, 2130542, 4261084, 5326355, 10652710, 21305420]

約数ペア:

[(1, 21305420), (2, 10652710), (4, 5326355), (5, 4261084), (10, 2130542), (17, 1253260), (20, 1065271), (34, 626630), (68, 313315), (85, 250652), (170, 125326), (223, 95540), (281, 75820), (340, 62663), (446, 47770), (562, 37910), (892, 23885), (1115, 19108), (1124, 18955), (1405, 15164), (2230, 9554), (2810, 7582), (3791, 5620), (4460, 4777)]