20945000

素因数分解:

$2^3\times 5^4\times {\mathrm{59}}^1\times {\mathrm{71}}^1$

素因数の和:156

約数の個数: 80

約数和(自身を含む): 50608800

約数和(自身を除く): 29663800

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 59, 71, 100, 118, 125, 142, 200, 236, 250, 284, 295, 355, 472, 500, 568, 590, 625, 710, 1000, 1180, 1250, 1420, 1475, 1775, 2360, 2500, 2840, 2950, 3550, 4189, 5000, 5900, 7100, 7375, 8378, 8875, 11800, 14200, 14750, 16756, 17750, 20945, 29500, 33512, 35500, 36875, 41890, 44375, 59000, 71000, 73750, 83780, 88750, 104725, 147500, 167560, 177500, 209450, 295000, 355000, 418900, 523625, 837800, 1047250, 2094500, 2618125, 4189000, 5236250, 10472500, 20945000]

約数ペア:

[(1, 20945000), (2, 10472500), (4, 5236250), (5, 4189000), (8, 2618125), (10, 2094500), (20, 1047250), (25, 837800), (40, 523625), (50, 418900), (59, 355000), (71, 295000), (100, 209450), (118, 177500), (125, 167560), (142, 147500), (200, 104725), (236, 88750), (250, 83780), (284, 73750), (295, 71000), (355, 59000), (472, 44375), (500, 41890), (568, 36875), (590, 35500), (625, 33512), (710, 29500), (1000, 20945), (1180, 17750), (1250, 16756), (1420, 14750), (1475, 14200), (1775, 11800), (2360, 8875), (2500, 8378), (2840, 7375), (2950, 7100), (3550, 5900), (4189, 5000)]