21043491

素因数分解:

$3^1\times 7^2\times {\mathrm{37}}^1\times {\mathrm{53}}^1\times {\mathrm{73}}^1$

素因数の和:180

約数の個数: 48

約数和(自身を含む): 34621344

約数和(自身を除く): 13577853

約数列:

[1, 3, 7, 21, 37, 49, 53, 73, 111, 147, 159, 219, 259, 371, 511, 777, 1113, 1533, 1813, 1961, 2597, 2701, 3577, 3869, 5439, 5883, 7791, 8103, 10731, 11607, 13727, 18907, 27083, 41181, 56721, 81249, 96089, 132349, 143153, 189581, 288267, 397047, 429459, 568743, 1002071, 3006213, 7014497, 21043491]

約数ペア:

[(1, 21043491), (3, 7014497), (7, 3006213), (21, 1002071), (37, 568743), (49, 429459), (53, 397047), (73, 288267), (111, 189581), (147, 143153), (159, 132349), (219, 96089), (259, 81249), (371, 56721), (511, 41181), (777, 27083), (1113, 18907), (1533, 13727), (1813, 11607), (1961, 10731), (2597, 8103), (2701, 7791), (3577, 5883), (3869, 5439)]