20890905

素因数分解:

$3^1\times 5^1\times 7^2\times {\mathrm{43}}^1\times {\mathrm{661}}^1$

素因数の和:726

約数の個数: 48

約数和(自身を含む): 39847104

約数和(自身を除く): 18956199

約数列:

[1, 3, 5, 7, 15, 21, 35, 43, 49, 105, 129, 147, 215, 245, 301, 645, 661, 735, 903, 1505, 1983, 2107, 3305, 4515, 4627, 6321, 9915, 10535, 13881, 23135, 28423, 31605, 32389, 69405, 85269, 97167, 142115, 161945, 198961, 426345, 485835, 596883, 994805, 1392727, 2984415, 4178181, 6963635, 20890905]

約数ペア:

[(1, 20890905), (3, 6963635), (5, 4178181), (7, 2984415), (15, 1392727), (21, 994805), (35, 596883), (43, 485835), (49, 426345), (105, 198961), (129, 161945), (147, 142115), (215, 97167), (245, 85269), (301, 69405), (645, 32389), (661, 31605), (735, 28423), (903, 23135), (1505, 13881), (1983, 10535), (2107, 9915), (3305, 6321), (4515, 4627)]