21280076

素因数分解:

$2^2\times {\mathrm{19}}^1\times {\mathrm{280001}}^1$

素因数の和:280024

約数の個数: 12

約数和(自身を含む): 39200280

約数和(自身を除く): 17920204

約数列:

[1, 2, 4, 19, 38, 76, 280001, 560002, 1120004, 5320019, 10640038, 21280076]

約数ペア:

[(1, 21280076), (2, 10640038), (4, 5320019), (19, 1120004), (38, 560002), (76, 280001)]