20998480

素因数分解:

$2^4\times 5^1\times {\mathrm{199}}^1\times {\mathrm{1319}}^1$

素因数の和:1531

約数の個数: 40

約数和(自身を含む): 49104000

約数和(自身を除く): 28105520

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 199, 398, 796, 995, 1319, 1592, 1990, 2638, 3184, 3980, 5276, 6595, 7960, 10552, 13190, 15920, 21104, 26380, 52760, 105520, 262481, 524962, 1049924, 1312405, 2099848, 2624810, 4199696, 5249620, 10499240, 20998480]

約数ペア:

[(1, 20998480), (2, 10499240), (4, 5249620), (5, 4199696), (8, 2624810), (10, 2099848), (16, 1312405), (20, 1049924), (40, 524962), (80, 262481), (199, 105520), (398, 52760), (796, 26380), (995, 21104), (1319, 15920), (1592, 13190), (1990, 10552), (2638, 7960), (3184, 6595), (3980, 5276)]