19988775

素因数分解:

$3^4\times 5^2\times {\mathrm{9871}}^1$

素因数の和:9893

約数の個数: 30

約数和(自身を含む): 37029872

約数和(自身を除く): 17041097

約数列:

[1, 3, 5, 9, 15, 25, 27, 45, 75, 81, 135, 225, 405, 675, 2025, 9871, 29613, 49355, 88839, 148065, 246775, 266517, 444195, 740325, 799551, 1332585, 2220975, 3997755, 6662925, 19988775]

約数ペア:

[(1, 19988775), (3, 6662925), (5, 3997755), (9, 2220975), (15, 1332585), (25, 799551), (27, 740325), (45, 444195), (75, 266517), (81, 246775), (135, 148065), (225, 88839), (405, 49355), (675, 29613), (2025, 9871)]