20640975

素因数分解:

$3^1\times 5^2\times {\mathrm{17}}^1\times {\mathrm{16189}}^1$

素因数の和:16219

約数の個数: 24

約数和(自身を含む): 36136080

約数和(自身を除く): 15495105

約数列:

[1, 3, 5, 15, 17, 25, 51, 75, 85, 255, 425, 1275, 16189, 48567, 80945, 242835, 275213, 404725, 825639, 1214175, 1376065, 4128195, 6880325, 20640975]

約数ペア:

[(1, 20640975), (3, 6880325), (5, 4128195), (15, 1376065), (17, 1214175), (25, 825639), (51, 404725), (75, 275213), (85, 242835), (255, 80945), (425, 48567), (1275, 16189)]