21291823

素因数分解:

$7^2\times {\mathrm{31}}^1\times {\mathrm{107}}^1\times {\mathrm{131}}^1$

素因数の和:283

約数の個数: 24

約数和(自身を含む): 26002944

約数和(自身を除く): 4711121

約数列:

[1, 7, 31, 49, 107, 131, 217, 749, 917, 1519, 3317, 4061, 5243, 6419, 14017, 23219, 28427, 98119, 162533, 198989, 434527, 686833, 3041689, 21291823]

約数ペア:

[(1, 21291823), (7, 3041689), (31, 686833), (49, 434527), (107, 198989), (131, 162533), (217, 98119), (749, 28427), (917, 23219), (1519, 14017), (3317, 6419), (4061, 5243)]