2172905

素因数分解:

$5^1\times 7^4\times {\mathrm{181}}^1$

素因数の和:214

約数の個数: 20

約数和(自身を含む): 3058692

約数和(自身を除く): 885787

約数列:

[1, 5, 7, 35, 49, 181, 245, 343, 905, 1267, 1715, 2401, 6335, 8869, 12005, 44345, 62083, 310415, 434581, 2172905]

約数ペア:

[(1, 2172905), (5, 434581), (7, 310415), (35, 62083), (49, 44345), (181, 12005), (245, 8869), (343, 6335), (905, 2401), (1267, 1715)]