21521973

素因数分解:

$3^1\times {\mathrm{11}}^1\times {\mathrm{29}}^1\times {\mathrm{43}}^1\times {\mathrm{523}}^1$

素因数の和:609

約数の個数: 32

約数和(自身を含む): 33200640

約数和(自身を除く): 11678667

約数列:

[1, 3, 11, 29, 33, 43, 87, 129, 319, 473, 523, 957, 1247, 1419, 1569, 3741, 5753, 13717, 15167, 17259, 22489, 41151, 45501, 67467, 166837, 247379, 500511, 652181, 742137, 1956543, 7173991, 21521973]

約数ペア:

[(1, 21521973), (3, 7173991), (11, 1956543), (29, 742137), (33, 652181), (43, 500511), (87, 247379), (129, 166837), (319, 67467), (473, 45501), (523, 41151), (957, 22489), (1247, 17259), (1419, 15167), (1569, 13717), (3741, 5753)]