18520191

素因数分解:

$3^3\times {\mathrm{17}}^1\times {\mathrm{157}}^1\times {\mathrm{257}}^1$

素因数の和:440

約数の個数: 32

約数和(自身を含む): 29350080

約数和(自身を除く): 10829889

約数列:

[1, 3, 9, 17, 27, 51, 153, 157, 257, 459, 471, 771, 1413, 2313, 2669, 4239, 4369, 6939, 8007, 13107, 24021, 39321, 40349, 72063, 117963, 121047, 363141, 685933, 1089423, 2057799, 6173397, 18520191]

約数ペア:

[(1, 18520191), (3, 6173397), (9, 2057799), (17, 1089423), (27, 685933), (51, 363141), (153, 121047), (157, 117963), (257, 72063), (459, 40349), (471, 39321), (771, 24021), (1413, 13107), (2313, 8007), (2669, 6939), (4239, 4369)]