21387978

素因数分解:

$2^1\times 3^2\times {\mathrm{41}}^1\times {\mathrm{73}}^1\times {\mathrm{397}}^1$

素因数の和:519

約数の個数: 48

約数和(自身を含む): 48242376

約数和(自身を除く): 26854398

約数列:

[1, 2, 3, 6, 9, 18, 41, 73, 82, 123, 146, 219, 246, 369, 397, 438, 657, 738, 794, 1191, 1314, 2382, 2993, 3573, 5986, 7146, 8979, 16277, 17958, 26937, 28981, 32554, 48831, 53874, 57962, 86943, 97662, 146493, 173886, 260829, 292986, 521658, 1188221, 2376442, 3564663, 7129326, 10693989, 21387978]

約数ペア:

[(1, 21387978), (2, 10693989), (3, 7129326), (6, 3564663), (9, 2376442), (18, 1188221), (41, 521658), (73, 292986), (82, 260829), (123, 173886), (146, 146493), (219, 97662), (246, 86943), (369, 57962), (397, 53874), (438, 48831), (657, 32554), (738, 28981), (794, 26937), (1191, 17958), (1314, 16277), (2382, 8979), (2993, 7146), (3573, 5986)]