20505825

素因数分解:

$3^3\times 5^2\times {\mathrm{17}}^1\times {\mathrm{1787}}^1$

素因数の和:1823

約数の個数: 48

約数和(自身を含む): 39908160

約数和(自身を除く): 19402335

約数列:

[1, 3, 5, 9, 15, 17, 25, 27, 45, 51, 75, 85, 135, 153, 225, 255, 425, 459, 675, 765, 1275, 1787, 2295, 3825, 5361, 8935, 11475, 16083, 26805, 30379, 44675, 48249, 80415, 91137, 134025, 151895, 241245, 273411, 402075, 455685, 759475, 820233, 1206225, 1367055, 2278425, 4101165, 6835275, 20505825]

約数ペア:

[(1, 20505825), (3, 6835275), (5, 4101165), (9, 2278425), (15, 1367055), (17, 1206225), (25, 820233), (27, 759475), (45, 455685), (51, 402075), (75, 273411), (85, 241245), (135, 151895), (153, 134025), (225, 91137), (255, 80415), (425, 48249), (459, 44675), (675, 30379), (765, 26805), (1275, 16083), (1787, 11475), (2295, 8935), (3825, 5361)]