18178911

素因数分解:

$3^4\times {\mathrm{29}}^1\times {\mathrm{71}}^1\times {\mathrm{109}}^1$

素因数の和:221

約数の個数: 40

約数和(自身を含む): 28749600

約数和(自身を除く): 10570689

約数列:

[1, 3, 9, 27, 29, 71, 81, 87, 109, 213, 261, 327, 639, 783, 981, 1917, 2059, 2349, 2943, 3161, 5751, 6177, 7739, 8829, 9483, 18531, 23217, 28449, 55593, 69651, 85347, 166779, 208953, 224431, 256041, 626859, 673293, 2019879, 6059637, 18178911]

約数ペア:

[(1, 18178911), (3, 6059637), (9, 2019879), (27, 673293), (29, 626859), (71, 256041), (81, 224431), (87, 208953), (109, 166779), (213, 85347), (261, 69651), (327, 55593), (639, 28449), (783, 23217), (981, 18531), (1917, 9483), (2059, 8829), (2349, 7739), (2943, 6177), (3161, 5751)]