21039543

素因数分解:

$3^2\times 7^1\times {\mathrm{521}}^1\times {\mathrm{641}}^1$

素因数の和:1175

約数の個数: 24

約数和(自身を含む): 34852896

約数和(自身を除く): 13813353

約数列:

[1, 3, 7, 9, 21, 63, 521, 641, 1563, 1923, 3647, 4487, 4689, 5769, 10941, 13461, 32823, 40383, 333961, 1001883, 2337727, 3005649, 7013181, 21039543]

約数ペア:

[(1, 21039543), (3, 7013181), (7, 3005649), (9, 2337727), (21, 1001883), (63, 333961), (521, 40383), (641, 32823), (1563, 13461), (1923, 10941), (3647, 5769), (4487, 4689)]