21505155

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{109}}^1\times {\mathrm{1879}}^1$

素因数の和:2003

約数の個数: 32

約数和(自身を含む): 39705600

約数和(自身を除く): 18200445

約数列:

[1, 3, 5, 7, 15, 21, 35, 105, 109, 327, 545, 763, 1635, 1879, 2289, 3815, 5637, 9395, 11445, 13153, 28185, 39459, 65765, 197295, 204811, 614433, 1024055, 1433677, 3072165, 4301031, 7168385, 21505155]

約数ペア:

[(1, 21505155), (3, 7168385), (5, 4301031), (7, 3072165), (15, 1433677), (21, 1024055), (35, 614433), (105, 204811), (109, 197295), (327, 65765), (545, 39459), (763, 28185), (1635, 13153), (1879, 11445), (2289, 9395), (3815, 5637)]