20790189

素因数分解:

$3^4\times 7^1\times {\mathrm{37}}^1\times {\mathrm{991}}^1$

素因数の和:1047

約数の個数: 40

約数和(自身を含む): 36489728

約数和(自身を除く): 15699539

約数列:

[1, 3, 7, 9, 21, 27, 37, 63, 81, 111, 189, 259, 333, 567, 777, 991, 999, 2331, 2973, 2997, 6937, 6993, 8919, 20811, 20979, 26757, 36667, 62433, 80271, 110001, 187299, 256669, 330003, 561897, 770007, 990009, 2310021, 2970027, 6930063, 20790189]

約数ペア:

[(1, 20790189), (3, 6930063), (7, 2970027), (9, 2310021), (21, 990009), (27, 770007), (37, 561897), (63, 330003), (81, 256669), (111, 187299), (189, 110001), (259, 80271), (333, 62433), (567, 36667), (777, 26757), (991, 20979), (999, 20811), (2331, 8919), (2973, 6993), (2997, 6937)]