21654220

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{137}}^1\times {\mathrm{1129}}^1$

素因数の和:1282

約数の個数: 48

約数和(自身を含む): 52395840

約数和(自身を除く): 30741620

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 137, 140, 274, 548, 685, 959, 1129, 1370, 1918, 2258, 2740, 3836, 4516, 4795, 5645, 7903, 9590, 11290, 15806, 19180, 22580, 31612, 39515, 79030, 154673, 158060, 309346, 618692, 773365, 1082711, 1546730, 2165422, 3093460, 4330844, 5413555, 10827110, 21654220]

約数ペア:

[(1, 21654220), (2, 10827110), (4, 5413555), (5, 4330844), (7, 3093460), (10, 2165422), (14, 1546730), (20, 1082711), (28, 773365), (35, 618692), (70, 309346), (137, 158060), (140, 154673), (274, 79030), (548, 39515), (685, 31612), (959, 22580), (1129, 19180), (1370, 15806), (1918, 11290), (2258, 9590), (2740, 7903), (3836, 5645), (4516, 4795)]