17780

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{127}}^1$

素因数の和:143

約数の個数: 24

約数和(自身を含む): 43008

約数和(自身を除く): 25228

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 127, 140, 254, 508, 635, 889, 1270, 1778, 2540, 3556, 4445, 8890, 17780]

約数ペア:

[(1, 17780), (2, 8890), (4, 4445), (5, 3556), (7, 2540), (10, 1778), (14, 1270), (20, 889), (28, 635), (35, 508), (70, 254), (127, 140)]