20978811

素因数分解:

$3^3\times 7^2\times {\mathrm{101}}^1\times {\mathrm{157}}^1$

素因数の和:281

約数の個数: 48

約数和(自身を含む): 36744480

約数和(自身を除く): 15765669

約数列:

[1, 3, 7, 9, 21, 27, 49, 63, 101, 147, 157, 189, 303, 441, 471, 707, 909, 1099, 1323, 1413, 2121, 2727, 3297, 4239, 4949, 6363, 7693, 9891, 14847, 15857, 19089, 23079, 29673, 44541, 47571, 69237, 110999, 133623, 142713, 207711, 332997, 428139, 776993, 998991, 2330979, 2996973, 6992937, 20978811]

約数ペア:

[(1, 20978811), (3, 6992937), (7, 2996973), (9, 2330979), (21, 998991), (27, 776993), (49, 428139), (63, 332997), (101, 207711), (147, 142713), (157, 133623), (189, 110999), (303, 69237), (441, 47571), (471, 44541), (707, 29673), (909, 23079), (1099, 19089), (1323, 15857), (1413, 14847), (2121, 9891), (2727, 7693), (3297, 6363), (4239, 4949)]