21000978

素因数分解:

$2^1\times 3^3\times {\mathrm{23}}^1\times {\mathrm{37}}^1\times {\mathrm{457}}^1$

素因数の和:528

約数の個数: 64

約数和(自身を含む): 50123520

約数和(自身を除く): 29122542

約数列:

[1, 2, 3, 6, 9, 18, 23, 27, 37, 46, 54, 69, 74, 111, 138, 207, 222, 333, 414, 457, 621, 666, 851, 914, 999, 1242, 1371, 1702, 1998, 2553, 2742, 4113, 5106, 7659, 8226, 10511, 12339, 15318, 16909, 21022, 22977, 24678, 31533, 33818, 45954, 50727, 63066, 94599, 101454, 152181, 189198, 283797, 304362, 388907, 456543, 567594, 777814, 913086, 1166721, 2333442, 3500163, 7000326, 10500489, 21000978]

約数ペア:

[(1, 21000978), (2, 10500489), (3, 7000326), (6, 3500163), (9, 2333442), (18, 1166721), (23, 913086), (27, 777814), (37, 567594), (46, 456543), (54, 388907), (69, 304362), (74, 283797), (111, 189198), (138, 152181), (207, 101454), (222, 94599), (333, 63066), (414, 50727), (457, 45954), (621, 33818), (666, 31533), (851, 24678), (914, 22977), (999, 21022), (1242, 16909), (1371, 15318), (1702, 12339), (1998, 10511), (2553, 8226), (2742, 7659), (4113, 5106)]