21028175

素因数分解:

$5^2\times 7^1\times {\mathrm{107}}^1\times {\mathrm{1123}}^1$

素因数の和:1247

約数の個数: 24

約数和(自身を含む): 30105216

約数和(自身を除く): 9077041

約数列:

[1, 5, 7, 25, 35, 107, 175, 535, 749, 1123, 2675, 3745, 5615, 7861, 18725, 28075, 39305, 120161, 196525, 600805, 841127, 3004025, 4205635, 21028175]

約数ペア:

[(1, 21028175), (5, 4205635), (7, 3004025), (25, 841127), (35, 600805), (107, 196525), (175, 120161), (535, 39305), (749, 28075), (1123, 18725), (2675, 7861), (3745, 5615)]