21139568

素因数分解:

$2^4\times {\mathrm{17}}^1\times {\mathrm{77719}}^1$

素因数の和:77744

約数の個数: 20

約数和(自身を含む): 43367760

約数和(自身を除く): 22228192

約数列:

[1, 2, 4, 8, 16, 17, 34, 68, 136, 272, 77719, 155438, 310876, 621752, 1243504, 1321223, 2642446, 5284892, 10569784, 21139568]

約数ペア:

[(1, 21139568), (2, 10569784), (4, 5284892), (8, 2642446), (16, 1321223), (17, 1243504), (34, 621752), (68, 310876), (136, 155438), (272, 77719)]