780

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{13}}^1$

素因数の和:25

約数の個数: 24

約数和(自身を含む): 2352

約数和(自身を除く): 1572

約数列:

[1, 2, 3, 4, 5, 6, 10, 12, 13, 15, 20, 26, 30, 39, 52, 60, 65, 78, 130, 156, 195, 260, 390, 780]

約数ペア:

[(1, 780), (2, 390), (3, 260), (4, 195), (5, 156), (6, 130), (10, 78), (12, 65), (13, 60), (15, 52), (20, 39), (26, 30)]