21207687

素因数分解:

$3^1\times {\mathrm{17}}^2\times {\mathrm{61}}^1\times {\mathrm{401}}^1$

素因数の和:499

約数の個数: 24

約数和(自身を含む): 30606672

約数和(自身を除く): 9398985

約数列:

[1, 3, 17, 51, 61, 183, 289, 401, 867, 1037, 1203, 3111, 6817, 17629, 20451, 24461, 52887, 73383, 115889, 347667, 415837, 1247511, 7069229, 21207687]

約数ペア:

[(1, 21207687), (3, 7069229), (17, 1247511), (51, 415837), (61, 347667), (183, 115889), (289, 73383), (401, 52887), (867, 24461), (1037, 20451), (1203, 17629), (3111, 6817)]