21004911

素因数分解:

$3^2\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{47}}^1\times {\mathrm{127}}^1$

素因数の和:220

約数の個数: 48

約数和(自身を含む): 34504704

約数和(自身を除く): 13499793

約数列:

[1, 3, 9, 17, 23, 47, 51, 69, 127, 141, 153, 207, 381, 391, 423, 799, 1081, 1143, 1173, 2159, 2397, 2921, 3243, 3519, 5969, 6477, 7191, 8763, 9729, 17907, 18377, 19431, 26289, 49657, 53721, 55131, 101473, 137287, 148971, 165393, 304419, 411861, 446913, 913257, 1235583, 2333879, 7001637, 21004911]

約数ペア:

[(1, 21004911), (3, 7001637), (9, 2333879), (17, 1235583), (23, 913257), (47, 446913), (51, 411861), (69, 304419), (127, 165393), (141, 148971), (153, 137287), (207, 101473), (381, 55131), (391, 53721), (423, 49657), (799, 26289), (1081, 19431), (1143, 18377), (1173, 17907), (2159, 9729), (2397, 8763), (2921, 7191), (3243, 6477), (3519, 5969)]