21079975

素因数分解:

$5^2\times 7^1\times {\mathrm{163}}^1\times {\mathrm{739}}^1$

素因数の和:919

約数の個数: 24

約数和(自身を含む): 30097280

約数和(自身を除く): 9017305

約数列:

[1, 5, 7, 25, 35, 163, 175, 739, 815, 1141, 3695, 4075, 5173, 5705, 18475, 25865, 28525, 120457, 129325, 602285, 843199, 3011425, 4215995, 21079975]

約数ペア:

[(1, 21079975), (5, 4215995), (7, 3011425), (25, 843199), (35, 602285), (163, 129325), (175, 120457), (739, 28525), (815, 25865), (1141, 18475), (3695, 5705), (4075, 5173)]