3988000

素因数分解:

$2^5\times 5^3\times {\mathrm{997}}^1$

素因数の和:1022

約数の個数: 48

約数和(自身を含む): 9808344

約数和(自身を除く): 5820344

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 80, 100, 125, 160, 200, 250, 400, 500, 800, 997, 1000, 1994, 2000, 3988, 4000, 4985, 7976, 9970, 15952, 19940, 24925, 31904, 39880, 49850, 79760, 99700, 124625, 159520, 199400, 249250, 398800, 498500, 797600, 997000, 1994000, 3988000]

約数ペア:

[(1, 3988000), (2, 1994000), (4, 997000), (5, 797600), (8, 498500), (10, 398800), (16, 249250), (20, 199400), (25, 159520), (32, 124625), (40, 99700), (50, 79760), (80, 49850), (100, 39880), (125, 31904), (160, 24925), (200, 19940), (250, 15952), (400, 9970), (500, 7976), (800, 4985), (997, 4000), (1000, 3988), (1994, 2000)]