21556815

素因数分解:

$3^1\times 5^1\times 7^2\times {\mathrm{139}}^1\times {\mathrm{211}}^1$

素因数の和:372

約数の個数: 48

約数和(自身を含む): 40602240

約数和(自身を除く): 19045425

約数列:

[1, 3, 5, 7, 15, 21, 35, 49, 105, 139, 147, 211, 245, 417, 633, 695, 735, 973, 1055, 1477, 2085, 2919, 3165, 4431, 4865, 6811, 7385, 10339, 14595, 20433, 22155, 29329, 31017, 34055, 51695, 87987, 102165, 146645, 155085, 205303, 439935, 615909, 1026515, 1437121, 3079545, 4311363, 7185605, 21556815]

約数ペア:

[(1, 21556815), (3, 7185605), (5, 4311363), (7, 3079545), (15, 1437121), (21, 1026515), (35, 615909), (49, 439935), (105, 205303), (139, 155085), (147, 146645), (211, 102165), (245, 87987), (417, 51695), (633, 34055), (695, 31017), (735, 29329), (973, 22155), (1055, 20433), (1477, 14595), (2085, 10339), (2919, 7385), (3165, 6811), (4431, 4865)]