21539763

素因数分解:

$3^8\times 7^2\times {\mathrm{67}}^1$

素因数の和:105

約数の個数: 54

約数和(自身を含む): 38143716

約数和(自身を除く): 16603953

約数列:

[1, 3, 7, 9, 21, 27, 49, 63, 67, 81, 147, 189, 201, 243, 441, 469, 567, 603, 729, 1323, 1407, 1701, 1809, 2187, 3283, 3969, 4221, 5103, 5427, 6561, 9849, 11907, 12663, 15309, 16281, 29547, 35721, 37989, 45927, 48843, 88641, 107163, 113967, 146529, 265923, 321489, 341901, 439587, 797769, 1025703, 2393307, 3077109, 7179921, 21539763]

約数ペア:

[(1, 21539763), (3, 7179921), (7, 3077109), (9, 2393307), (21, 1025703), (27, 797769), (49, 439587), (63, 341901), (67, 321489), (81, 265923), (147, 146529), (189, 113967), (201, 107163), (243, 88641), (441, 48843), (469, 45927), (567, 37989), (603, 35721), (729, 29547), (1323, 16281), (1407, 15309), (1701, 12663), (1809, 11907), (2187, 9849), (3283, 6561), (3969, 5427), (4221, 5103)]