18008020

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{21961}}^1$

素因数の和:22011

約数の個数: 24

約数和(自身を含む): 38740968

約数和(自身を除く): 20732948

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 820, 21961, 43922, 87844, 109805, 219610, 439220, 900401, 1800802, 3601604, 4502005, 9004010, 18008020]

約数ペア:

[(1, 18008020), (2, 9004010), (4, 4502005), (5, 3601604), (10, 1800802), (20, 900401), (41, 439220), (82, 219610), (164, 109805), (205, 87844), (410, 43922), (820, 21961)]