21391750

素因数分解:

$2^1\times 5^3\times {\mathrm{41}}^1\times {\mathrm{2087}}^1$

素因数の和:2145

約数の個数: 32

約数和(自身を含む): 41041728

約数和(自身を除く): 19649978

約数列:

[1, 2, 5, 10, 25, 41, 50, 82, 125, 205, 250, 410, 1025, 2050, 2087, 4174, 5125, 10250, 10435, 20870, 52175, 85567, 104350, 171134, 260875, 427835, 521750, 855670, 2139175, 4278350, 10695875, 21391750]

約数ペア:

[(1, 21391750), (2, 10695875), (5, 4278350), (10, 2139175), (25, 855670), (41, 521750), (50, 427835), (82, 260875), (125, 171134), (205, 104350), (250, 85567), (410, 52175), (1025, 20870), (2050, 10435), (2087, 10250), (4174, 5125)]