991000

素因数分解:

$2^3\times 5^3\times {\mathrm{991}}^1$

素因数の和:1012

約数の個数: 32

約数和(自身を含む): 2321280

約数和(自身を除く): 1330280

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 125, 200, 250, 500, 991, 1000, 1982, 3964, 4955, 7928, 9910, 19820, 24775, 39640, 49550, 99100, 123875, 198200, 247750, 495500, 991000]

約数ペア:

[(1, 991000), (2, 495500), (4, 247750), (5, 198200), (8, 123875), (10, 99100), (20, 49550), (25, 39640), (40, 24775), (50, 19820), (100, 9910), (125, 7928), (200, 4955), (250, 3964), (500, 1982), (991, 1000)]