21407505

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{67}}^1\times {\mathrm{179}}^1$

素因数の和:278

約数の個数: 64

約数和(自身を含む): 42301440

約数和(自身を除く): 20893935

約数列:

[1, 3, 5, 7, 15, 17, 21, 35, 51, 67, 85, 105, 119, 179, 201, 255, 335, 357, 469, 537, 595, 895, 1005, 1139, 1253, 1407, 1785, 2345, 2685, 3043, 3417, 3759, 5695, 6265, 7035, 7973, 9129, 11993, 15215, 17085, 18795, 21301, 23919, 35979, 39865, 45645, 59965, 63903, 83951, 106505, 119595, 179895, 203881, 251853, 319515, 419755, 611643, 1019405, 1259265, 1427167, 3058215, 4281501, 7135835, 21407505]

約数ペア:

[(1, 21407505), (3, 7135835), (5, 4281501), (7, 3058215), (15, 1427167), (17, 1259265), (21, 1019405), (35, 611643), (51, 419755), (67, 319515), (85, 251853), (105, 203881), (119, 179895), (179, 119595), (201, 106505), (255, 83951), (335, 63903), (357, 59965), (469, 45645), (537, 39865), (595, 35979), (895, 23919), (1005, 21301), (1139, 18795), (1253, 17085), (1407, 15215), (1785, 11993), (2345, 9129), (2685, 7973), (3043, 7035), (3417, 6265), (3759, 5695)]