20738728

素因数分解:

$2^3\times {\mathrm{19}}^2\times {\mathrm{43}}^1\times {\mathrm{167}}^1$

素因数の和:254

約数の個数: 48

約数和(自身を含む): 42245280

約数和(自身を除く): 21506552

約数列:

[1, 2, 4, 8, 19, 38, 43, 76, 86, 152, 167, 172, 334, 344, 361, 668, 722, 817, 1336, 1444, 1634, 2888, 3173, 3268, 6346, 6536, 7181, 12692, 14362, 15523, 25384, 28724, 31046, 57448, 60287, 62092, 120574, 124184, 136439, 241148, 272878, 482296, 545756, 1091512, 2592341, 5184682, 10369364, 20738728]

約数ペア:

[(1, 20738728), (2, 10369364), (4, 5184682), (8, 2592341), (19, 1091512), (38, 545756), (43, 482296), (76, 272878), (86, 241148), (152, 136439), (167, 124184), (172, 120574), (334, 62092), (344, 60287), (361, 57448), (668, 31046), (722, 28724), (817, 25384), (1336, 15523), (1444, 14362), (1634, 12692), (2888, 7181), (3173, 6536), (3268, 6346)]