21042855

素因数分解:

$3^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{53}}^1\times {\mathrm{173}}^1$

素因数の和:257

約数の個数: 64

約数和(自身を含む): 40590720

約数和(自身を除く): 19547865

約数列:

[1, 3, 5, 9, 15, 17, 27, 45, 51, 53, 85, 135, 153, 159, 173, 255, 265, 459, 477, 519, 765, 795, 865, 901, 1431, 1557, 2295, 2385, 2595, 2703, 2941, 4505, 4671, 7155, 7785, 8109, 8823, 9169, 13515, 14705, 23355, 24327, 26469, 27507, 40545, 44115, 45845, 79407, 82521, 121635, 132345, 137535, 155873, 247563, 397035, 412605, 467619, 779365, 1237815, 1402857, 2338095, 4208571, 7014285, 21042855]

約数ペア:

[(1, 21042855), (3, 7014285), (5, 4208571), (9, 2338095), (15, 1402857), (17, 1237815), (27, 779365), (45, 467619), (51, 412605), (53, 397035), (85, 247563), (135, 155873), (153, 137535), (159, 132345), (173, 121635), (255, 82521), (265, 79407), (459, 45845), (477, 44115), (519, 40545), (765, 27507), (795, 26469), (865, 24327), (901, 23355), (1431, 14705), (1557, 13515), (2295, 9169), (2385, 8823), (2595, 8109), (2703, 7785), (2941, 7155), (4505, 4671)]