21028660

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{127}}^1\times {\mathrm{487}}^1$

素因数の和:640

約数の個数: 48

約数和(自身を含む): 47222784

約数和(自身を除く): 26194124

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 127, 170, 254, 340, 487, 508, 635, 974, 1270, 1948, 2159, 2435, 2540, 4318, 4870, 8279, 8636, 9740, 10795, 16558, 21590, 33116, 41395, 43180, 61849, 82790, 123698, 165580, 247396, 309245, 618490, 1051433, 1236980, 2102866, 4205732, 5257165, 10514330, 21028660]

約数ペア:

[(1, 21028660), (2, 10514330), (4, 5257165), (5, 4205732), (10, 2102866), (17, 1236980), (20, 1051433), (34, 618490), (68, 309245), (85, 247396), (127, 165580), (170, 123698), (254, 82790), (340, 61849), (487, 43180), (508, 41395), (635, 33116), (974, 21590), (1270, 16558), (1948, 10795), (2159, 9740), (2435, 8636), (2540, 8279), (4318, 4870)]