18980829

素因数分解:

$3^2\times 7^1\times {\mathrm{19}}^1\times {\mathrm{101}}^1\times {\mathrm{157}}^1$

素因数の和:290

約数の個数: 48

約数和(自身を含む): 33521280

約数和(自身を除く): 14540451

約数列:

[1, 3, 7, 9, 19, 21, 57, 63, 101, 133, 157, 171, 303, 399, 471, 707, 909, 1099, 1197, 1413, 1919, 2121, 2983, 3297, 5757, 6363, 8949, 9891, 13433, 15857, 17271, 20881, 26847, 40299, 47571, 62643, 110999, 120897, 142713, 187929, 301283, 332997, 903849, 998991, 2108981, 2711547, 6326943, 18980829]

約数ペア:

[(1, 18980829), (3, 6326943), (7, 2711547), (9, 2108981), (19, 998991), (21, 903849), (57, 332997), (63, 301283), (101, 187929), (133, 142713), (157, 120897), (171, 110999), (303, 62643), (399, 47571), (471, 40299), (707, 26847), (909, 20881), (1099, 17271), (1197, 15857), (1413, 13433), (1919, 9891), (2121, 8949), (2983, 6363), (3297, 5757)]