19984220

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{24371}}^1$

素因数の和:24421

約数の個数: 24

約数和(自身を含む): 42992208

約数和(自身を除く): 23007988

約数列:

[1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 820, 24371, 48742, 97484, 121855, 243710, 487420, 999211, 1998422, 3996844, 4996055, 9992110, 19984220]

約数ペア:

[(1, 19984220), (2, 9992110), (4, 4996055), (5, 3996844), (10, 1998422), (20, 999211), (41, 487420), (82, 243710), (164, 121855), (205, 97484), (410, 48742), (820, 24371)]