678416

素因数分解:

$2^4\times {\mathrm{109}}^1\times {\mathrm{389}}^1$

素因数の和:506

約数の個数: 20

約数和(自身を含む): 1329900

約数和(自身を除く): 651484

約数列:

[1, 2, 4, 8, 16, 109, 218, 389, 436, 778, 872, 1556, 1744, 3112, 6224, 42401, 84802, 169604, 339208, 678416]

約数ペア:

[(1, 678416), (2, 339208), (4, 169604), (8, 84802), (16, 42401), (109, 6224), (218, 3112), (389, 1744), (436, 1556), (778, 872)]