20459000

素因数分解:

$2^3\times 5^3\times {\mathrm{41}}^1\times {\mathrm{499}}^1$

素因数の和:561

約数の個数: 64

約数和(自身を含む): 49140000

約数和(自身を除く): 28681000

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 41, 50, 82, 100, 125, 164, 200, 205, 250, 328, 410, 499, 500, 820, 998, 1000, 1025, 1640, 1996, 2050, 2495, 3992, 4100, 4990, 5125, 8200, 9980, 10250, 12475, 19960, 20459, 20500, 24950, 40918, 41000, 49900, 62375, 81836, 99800, 102295, 124750, 163672, 204590, 249500, 409180, 499000, 511475, 818360, 1022950, 2045900, 2557375, 4091800, 5114750, 10229500, 20459000]

約数ペア:

[(1, 20459000), (2, 10229500), (4, 5114750), (5, 4091800), (8, 2557375), (10, 2045900), (20, 1022950), (25, 818360), (40, 511475), (41, 499000), (50, 409180), (82, 249500), (100, 204590), (125, 163672), (164, 124750), (200, 102295), (205, 99800), (250, 81836), (328, 62375), (410, 49900), (499, 41000), (500, 40918), (820, 24950), (998, 20500), (1000, 20459), (1025, 19960), (1640, 12475), (1996, 10250), (2050, 9980), (2495, 8200), (3992, 5125), (4100, 4990)]