21131847

素因数分解:

$3^4\times {\mathrm{11}}^1\times {\mathrm{37}}^1\times {\mathrm{641}}^1$

素因数の和:701

約数の個数: 40

約数和(自身を含む): 35422992

約数和(自身を除く): 14291145

約数列:

[1, 3, 9, 11, 27, 33, 37, 81, 99, 111, 297, 333, 407, 641, 891, 999, 1221, 1923, 2997, 3663, 5769, 7051, 10989, 17307, 21153, 23717, 32967, 51921, 63459, 71151, 190377, 213453, 260887, 571131, 640359, 782661, 1921077, 2347983, 7043949, 21131847]

約数ペア:

[(1, 21131847), (3, 7043949), (9, 2347983), (11, 1921077), (27, 782661), (33, 640359), (37, 571131), (81, 260887), (99, 213453), (111, 190377), (297, 71151), (333, 63459), (407, 51921), (641, 32967), (891, 23717), (999, 21153), (1221, 17307), (1923, 10989), (2997, 7051), (3663, 5769)]