20958021

素因数分解:

$3^7\times 7^1\times {\mathrm{37}}^2$

素因数の和:102

約数の個数: 48

約数和(自身を含む): 36919680

約数和(自身を除く): 15961659

約数列:

[1, 3, 7, 9, 21, 27, 37, 63, 81, 111, 189, 243, 259, 333, 567, 729, 777, 999, 1369, 1701, 2187, 2331, 2997, 4107, 5103, 6993, 8991, 9583, 12321, 15309, 20979, 26973, 28749, 36963, 62937, 80919, 86247, 110889, 188811, 258741, 332667, 566433, 776223, 998001, 2328669, 2994003, 6986007, 20958021]

約数ペア:

[(1, 20958021), (3, 6986007), (7, 2994003), (9, 2328669), (21, 998001), (27, 776223), (37, 566433), (63, 332667), (81, 258741), (111, 188811), (189, 110889), (243, 86247), (259, 80919), (333, 62937), (567, 36963), (729, 28749), (777, 26973), (999, 20979), (1369, 15309), (1701, 12321), (2187, 9583), (2331, 8991), (2997, 6993), (4107, 5103)]