21403809

素因数分解:

$3^2\times 7^1\times {\mathrm{43}}^1\times {\mathrm{7901}}^1$

素因数の和:7957

約数の個数: 24

約数和(自身を含む): 36159552

約数和(自身を除く): 14755743

約数列:

[1, 3, 7, 9, 21, 43, 63, 129, 301, 387, 903, 2709, 7901, 23703, 55307, 71109, 165921, 339743, 497763, 1019229, 2378201, 3057687, 7134603, 21403809]

約数ペア:

[(1, 21403809), (3, 7134603), (7, 3057687), (9, 2378201), (21, 1019229), (43, 497763), (63, 339743), (129, 165921), (301, 71109), (387, 55307), (903, 23703), (2709, 7901)]