21985520

素因数分解:

$2^4\times 5^1\times {\mathrm{199}}^1\times {\mathrm{1381}}^1$

素因数の和:1593

約数の個数: 40

約数和(自身を含む): 51410400

約数和(自身を除く): 29424880

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 199, 398, 796, 995, 1381, 1592, 1990, 2762, 3184, 3980, 5524, 6905, 7960, 11048, 13810, 15920, 22096, 27620, 55240, 110480, 274819, 549638, 1099276, 1374095, 2198552, 2748190, 4397104, 5496380, 10992760, 21985520]

約数ペア:

[(1, 21985520), (2, 10992760), (4, 5496380), (5, 4397104), (8, 2748190), (10, 2198552), (16, 1374095), (20, 1099276), (40, 549638), (80, 274819), (199, 110480), (398, 55240), (796, 27620), (995, 22096), (1381, 15920), (1592, 13810), (1990, 11048), (2762, 7960), (3184, 6905), (3980, 5524)]