18661209

素因数分解:

$3^1\times 7^2\times {\mathrm{37}}^1\times {\mathrm{47}}^1\times {\mathrm{73}}^1$

素因数の和:174

約数の個数: 48

約数和(自身を含む): 30774528

約数和(自身を除く): 12113319

約数列:

[1, 3, 7, 21, 37, 47, 49, 73, 111, 141, 147, 219, 259, 329, 511, 777, 987, 1533, 1739, 1813, 2303, 2701, 3431, 3577, 5217, 5439, 6909, 8103, 10293, 10731, 12173, 18907, 24017, 36519, 56721, 72051, 85211, 126947, 132349, 168119, 255633, 380841, 397047, 504357, 888629, 2665887, 6220403, 18661209]

約数ペア:

[(1, 18661209), (3, 6220403), (7, 2665887), (21, 888629), (37, 504357), (47, 397047), (49, 380841), (73, 255633), (111, 168119), (141, 132349), (147, 126947), (219, 85211), (259, 72051), (329, 56721), (511, 36519), (777, 24017), (987, 18907), (1533, 12173), (1739, 10731), (1813, 10293), (2303, 8103), (2701, 6909), (3431, 5439), (3577, 5217)]