21009155

素因数分解:

$5^1\times {\mathrm{19}}^1\times {\mathrm{37}}^1\times {\mathrm{43}}^1\times {\mathrm{139}}^1$

素因数の和:243

約数の個数: 32

約数和(自身を含む): 28089600

約数和(自身を除く): 7080445

約数列:

[1, 5, 19, 37, 43, 95, 139, 185, 215, 695, 703, 817, 1591, 2641, 3515, 4085, 5143, 5977, 7955, 13205, 25715, 29885, 30229, 97717, 113563, 151145, 221149, 488585, 567815, 1105745, 4201831, 21009155]

約数ペア:

[(1, 21009155), (5, 4201831), (19, 1105745), (37, 567815), (43, 488585), (95, 221149), (139, 151145), (185, 113563), (215, 97717), (695, 30229), (703, 29885), (817, 25715), (1591, 13205), (2641, 7955), (3515, 5977), (4085, 5143)]