21904071

素因数分解:

$3^1\times 7^1\times {\mathrm{43}}^1\times {\mathrm{127}}^1\times {\mathrm{191}}^1$

素因数の和:371

約数の個数: 32

約数和(自身を含む): 34603008

約数和(自身を除く): 12698937

約数列:

[1, 3, 7, 21, 43, 127, 129, 191, 301, 381, 573, 889, 903, 1337, 2667, 4011, 5461, 8213, 16383, 24257, 24639, 38227, 57491, 72771, 114681, 169799, 172473, 509397, 1043051, 3129153, 7301357, 21904071]

約数ペア:

[(1, 21904071), (3, 7301357), (7, 3129153), (21, 1043051), (43, 509397), (127, 172473), (129, 169799), (191, 114681), (301, 72771), (381, 57491), (573, 38227), (889, 24639), (903, 24257), (1337, 16383), (2667, 8213), (4011, 5461)]