18720153

素因数分解:

$3^4\times {\mathrm{239}}^1\times {\mathrm{967}}^1$

素因数の和:1218

約数の個数: 20

約数和(自身を含む): 28110720

約数和(自身を除く): 9390567

約数列:

[1, 3, 9, 27, 81, 239, 717, 967, 2151, 2901, 6453, 8703, 19359, 26109, 78327, 231113, 693339, 2080017, 6240051, 18720153]

約数ペア:

[(1, 18720153), (3, 6240051), (9, 2080017), (27, 693339), (81, 231113), (239, 78327), (717, 26109), (967, 19359), (2151, 8703), (2901, 6453)]