989000

素因数分解:

$2^3\times 5^3\times {\mathrm{23}}^1\times {\mathrm{43}}^1$

素因数の和:87

約数の個数: 64

約数和(自身を含む): 2471040

約数和(自身を除く): 1482040

約数列:

[1, 2, 4, 5, 8, 10, 20, 23, 25, 40, 43, 46, 50, 86, 92, 100, 115, 125, 172, 184, 200, 215, 230, 250, 344, 430, 460, 500, 575, 860, 920, 989, 1000, 1075, 1150, 1720, 1978, 2150, 2300, 2875, 3956, 4300, 4600, 4945, 5375, 5750, 7912, 8600, 9890, 10750, 11500, 19780, 21500, 23000, 24725, 39560, 43000, 49450, 98900, 123625, 197800, 247250, 494500, 989000]

約数ペア:

[(1, 989000), (2, 494500), (4, 247250), (5, 197800), (8, 123625), (10, 98900), (20, 49450), (23, 43000), (25, 39560), (40, 24725), (43, 23000), (46, 21500), (50, 19780), (86, 11500), (92, 10750), (100, 9890), (115, 8600), (125, 7912), (172, 5750), (184, 5375), (200, 4945), (215, 4600), (230, 4300), (250, 3956), (344, 2875), (430, 2300), (460, 2150), (500, 1978), (575, 1720), (860, 1150), (920, 1075), (989, 1000)]