20781225

素因数分解:

$3^3\times 5^2\times {\mathrm{17}}^1\times {\mathrm{1811}}^1$

素因数の和:1847

約数の個数: 48

約数和(自身を含む): 40443840

約数和(自身を除く): 19662615

約数列:

[1, 3, 5, 9, 15, 17, 25, 27, 45, 51, 75, 85, 135, 153, 225, 255, 425, 459, 675, 765, 1275, 1811, 2295, 3825, 5433, 9055, 11475, 16299, 27165, 30787, 45275, 48897, 81495, 92361, 135825, 153935, 244485, 277083, 407475, 461805, 769675, 831249, 1222425, 1385415, 2309025, 4156245, 6927075, 20781225]

約数ペア:

[(1, 20781225), (3, 6927075), (5, 4156245), (9, 2309025), (15, 1385415), (17, 1222425), (25, 831249), (27, 769675), (45, 461805), (51, 407475), (75, 277083), (85, 244485), (135, 153935), (153, 135825), (225, 92361), (255, 81495), (425, 48897), (459, 45275), (675, 30787), (765, 27165), (1275, 16299), (1811, 11475), (2295, 9055), (3825, 5433)]