21891309

素因数分解:

$3^1\times {\mathrm{11}}^1\times {\mathrm{37}}^1\times {\mathrm{17929}}^1$

素因数の和:17980

約数の個数: 16

約数和(自身を含む): 32704320

約数和(自身を除く): 10813011

約数列:

[1, 3, 11, 33, 37, 111, 407, 1221, 17929, 53787, 197219, 591657, 663373, 1990119, 7297103, 21891309]

約数ペア:

[(1, 21891309), (3, 7297103), (11, 1990119), (33, 663373), (37, 591657), (111, 197219), (407, 53787), (1221, 17929)]