1781980

素因数分解:

$2^2\times 5^1\times {\mathrm{139}}^1\times {\mathrm{641}}^1$

素因数の和:789

約数の個数: 24

約数和(自身を含む): 3774960

約数和(自身を除く): 1992980

約数列:

[1, 2, 4, 5, 10, 20, 139, 278, 556, 641, 695, 1282, 1390, 2564, 2780, 3205, 6410, 12820, 89099, 178198, 356396, 445495, 890990, 1781980]

約数ペア:

[(1, 1781980), (2, 890990), (4, 445495), (5, 356396), (10, 178198), (20, 89099), (139, 12820), (278, 6410), (556, 3205), (641, 2780), (695, 2564), (1282, 1390)]