7988000

素因数分解:

$2^5\times 5^3\times {\mathrm{1997}}^1$

素因数の和:2022

約数の個数: 48

約数和(自身を含む): 19636344

約数和(自身を除く): 11648344

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 80, 100, 125, 160, 200, 250, 400, 500, 800, 1000, 1997, 2000, 3994, 4000, 7988, 9985, 15976, 19970, 31952, 39940, 49925, 63904, 79880, 99850, 159760, 199700, 249625, 319520, 399400, 499250, 798800, 998500, 1597600, 1997000, 3994000, 7988000]

約数ペア:

[(1, 7988000), (2, 3994000), (4, 1997000), (5, 1597600), (8, 998500), (10, 798800), (16, 499250), (20, 399400), (25, 319520), (32, 249625), (40, 199700), (50, 159760), (80, 99850), (100, 79880), (125, 63904), (160, 49925), (200, 39940), (250, 31952), (400, 19970), (500, 15976), (800, 9985), (1000, 7988), (1997, 4000), (2000, 3994)]