678980

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{1997}}^1$

素因数の和:2023

約数の個数: 24

約数和(自身を含む): 1510488

約数和(自身を除く): 831508

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 170, 340, 1997, 3994, 7988, 9985, 19970, 33949, 39940, 67898, 135796, 169745, 339490, 678980]

約数ペア:

[(1, 678980), (2, 339490), (4, 169745), (5, 135796), (10, 67898), (17, 39940), (20, 33949), (34, 19970), (68, 9985), (85, 7988), (170, 3994), (340, 1997)]