21705399

素因数分解:

$3^2\times {\mathrm{23}}^2\times {\mathrm{47}}^1\times {\mathrm{97}}^1$

素因数の和:196

約数の個数: 36

約数和(自身を含む): 33817056

約数和(自身を除く): 12111657

約数列:

[1, 3, 9, 23, 47, 69, 97, 141, 207, 291, 423, 529, 873, 1081, 1587, 2231, 3243, 4559, 4761, 6693, 9729, 13677, 20079, 24863, 41031, 51313, 74589, 104857, 153939, 223767, 314571, 461817, 943713, 2411711, 7235133, 21705399]

約数ペア:

[(1, 21705399), (3, 7235133), (9, 2411711), (23, 943713), (47, 461817), (69, 314571), (97, 223767), (141, 153939), (207, 104857), (291, 74589), (423, 51313), (529, 41031), (873, 24863), (1081, 20079), (1587, 13677), (2231, 9729), (3243, 6693), (4559, 4761)]