21991000

素因数分解:

$2^3\times 5^3\times {\mathrm{21991}}^1$

素因数の和:22012

約数の個数: 32

約数和(自身を含む): 51461280

約数和(自身を除く): 29470280

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 125, 200, 250, 500, 1000, 21991, 43982, 87964, 109955, 175928, 219910, 439820, 549775, 879640, 1099550, 2199100, 2748875, 4398200, 5497750, 10995500, 21991000]

約数ペア:

[(1, 21991000), (2, 10995500), (4, 5497750), (5, 4398200), (8, 2748875), (10, 2199100), (20, 1099550), (25, 879640), (40, 549775), (50, 439820), (100, 219910), (125, 175928), (200, 109955), (250, 87964), (500, 43982), (1000, 21991)]