21287409

素因数分解:

$3^1\times {\mathrm{11}}^2\times {\mathrm{13}}^2\times {\mathrm{347}}^1$

素因数の和:398

約数の個数: 36

約数和(自身を含む): 33879888

約数和(自身を除く): 12592479

約数列:

[1, 3, 11, 13, 33, 39, 121, 143, 169, 347, 363, 429, 507, 1041, 1573, 1859, 3817, 4511, 4719, 5577, 11451, 13533, 20449, 41987, 49621, 58643, 61347, 125961, 148863, 175929, 545831, 645073, 1637493, 1935219, 7095803, 21287409]

約数ペア:

[(1, 21287409), (3, 7095803), (11, 1935219), (13, 1637493), (33, 645073), (39, 545831), (121, 175929), (143, 148863), (169, 125961), (347, 61347), (363, 58643), (429, 49621), (507, 41987), (1041, 20449), (1573, 13533), (1859, 11451), (3817, 5577), (4511, 4719)]