21091191

素因数分解:

$3^1\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{53}}^1\times {\mathrm{389}}^1$

素因数の和:487

約数の個数: 32

約数和(自身を含む): 32348160

約数和(自身を除く): 11256969

約数列:

[1, 3, 11, 31, 33, 53, 93, 159, 341, 389, 583, 1023, 1167, 1643, 1749, 4279, 4929, 12059, 12837, 18073, 20617, 36177, 54219, 61851, 132649, 226787, 397947, 639127, 680361, 1917381, 7030397, 21091191]

約数ペア:

[(1, 21091191), (3, 7030397), (11, 1917381), (31, 680361), (33, 639127), (53, 397947), (93, 226787), (159, 132649), (341, 61851), (389, 54219), (583, 36177), (1023, 20617), (1167, 18073), (1643, 12837), (1749, 12059), (4279, 4929)]