209780

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{617}}^1$

素因数の和:643

約数の個数: 24

約数和(自身を含む): 467208

約数和(自身を除く): 257428

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 170, 340, 617, 1234, 2468, 3085, 6170, 10489, 12340, 20978, 41956, 52445, 104890, 209780]

約数ペア:

[(1, 209780), (2, 104890), (4, 52445), (5, 41956), (10, 20978), (17, 12340), (20, 10489), (34, 6170), (68, 3085), (85, 2468), (170, 1234), (340, 617)]