20655817

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{71}}^1\times {\mathrm{139}}^1$

素因数の和:253

約数の個数: 32

約数和(自身を含む): 27095040

約数和(自身を除く): 6439223

約数列:

[1, 7, 13, 23, 71, 91, 139, 161, 299, 497, 923, 973, 1633, 1807, 2093, 3197, 6461, 9869, 11431, 12649, 21229, 22379, 41561, 69083, 128297, 148603, 226987, 290927, 898079, 1588909, 2950831, 20655817]

約数ペア:

[(1, 20655817), (7, 2950831), (13, 1588909), (23, 898079), (71, 290927), (91, 226987), (139, 148603), (161, 128297), (299, 69083), (497, 41561), (923, 22379), (973, 21229), (1633, 12649), (1807, 11431), (2093, 9869), (3197, 6461)]