20840895

素因数分解:

$3^5\times 5^1\times {\mathrm{17}}^1\times {\mathrm{1009}}^1$

素因数の和:1046

約数の個数: 48

約数和(自身を含む): 39705120

約数和(自身を除く): 18864225

約数列:

[1, 3, 5, 9, 15, 17, 27, 45, 51, 81, 85, 135, 153, 243, 255, 405, 459, 765, 1009, 1215, 1377, 2295, 3027, 4131, 5045, 6885, 9081, 15135, 17153, 20655, 27243, 45405, 51459, 81729, 85765, 136215, 154377, 245187, 257295, 408645, 463131, 771885, 1225935, 1389393, 2315655, 4168179, 6946965, 20840895]

約数ペア:

[(1, 20840895), (3, 6946965), (5, 4168179), (9, 2315655), (15, 1389393), (17, 1225935), (27, 771885), (45, 463131), (51, 408645), (81, 257295), (85, 245187), (135, 154377), (153, 136215), (243, 85765), (255, 81729), (405, 51459), (459, 45405), (765, 27243), (1009, 20655), (1215, 17153), (1377, 15135), (2295, 9081), (3027, 6885), (4131, 5045)]