19986380

素因数分解:

$2^2\times 5^1\times {\mathrm{641}}^1\times {\mathrm{1559}}^1$

素因数の和:2209

約数の個数: 24

約数和(自身を含む): 42063840

約数和(自身を除く): 22077460

約数列:

[1, 2, 4, 5, 10, 20, 641, 1282, 1559, 2564, 3118, 3205, 6236, 6410, 7795, 12820, 15590, 31180, 999319, 1998638, 3997276, 4996595, 9993190, 19986380]

約数ペア:

[(1, 19986380), (2, 9993190), (4, 4996595), (5, 3997276), (10, 1998638), (20, 999319), (641, 31180), (1282, 15590), (1559, 12820), (2564, 7795), (3118, 6410), (3205, 6236)]