20002000

素因数分解:

$2^4\times 5^3\times {\mathrm{73}}^1\times {\mathrm{137}}^1$

素因数の和:233

約数の個数: 80

約数和(自身を含む): 49385232

約数和(自身を除く): 29383232

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 73, 80, 100, 125, 137, 146, 200, 250, 274, 292, 365, 400, 500, 548, 584, 685, 730, 1000, 1096, 1168, 1370, 1460, 1825, 2000, 2192, 2740, 2920, 3425, 3650, 5480, 5840, 6850, 7300, 9125, 10001, 10960, 13700, 14600, 17125, 18250, 20002, 27400, 29200, 34250, 36500, 40004, 50005, 54800, 68500, 73000, 80008, 100010, 137000, 146000, 160016, 200020, 250025, 274000, 400040, 500050, 800080, 1000100, 1250125, 2000200, 2500250, 4000400, 5000500, 10001000, 20002000]

約数ペア:

[(1, 20002000), (2, 10001000), (4, 5000500), (5, 4000400), (8, 2500250), (10, 2000200), (16, 1250125), (20, 1000100), (25, 800080), (40, 500050), (50, 400040), (73, 274000), (80, 250025), (100, 200020), (125, 160016), (137, 146000), (146, 137000), (200, 100010), (250, 80008), (274, 73000), (292, 68500), (365, 54800), (400, 50005), (500, 40004), (548, 36500), (584, 34250), (685, 29200), (730, 27400), (1000, 20002), (1096, 18250), (1168, 17125), (1370, 14600), (1460, 13700), (1825, 10960), (2000, 10001), (2192, 9125), (2740, 7300), (2920, 6850), (3425, 5840), (3650, 5480)]