21820281

素因数分解:

$3^1\times 7^1\times {\mathrm{641}}^1\times {\mathrm{1621}}^1$

素因数の和:2272

約数の個数: 16

約数和(自身を含む): 33322368

約数和(自身を除く): 11502087

約数列:

[1, 3, 7, 21, 641, 1621, 1923, 4487, 4863, 11347, 13461, 34041, 1039061, 3117183, 7273427, 21820281]

約数ペア:

[(1, 21820281), (3, 7273427), (7, 3117183), (21, 1039061), (641, 34041), (1621, 13461), (1923, 11347), (4487, 4863)]