19981577

素因数分解:

$7^1\times {\mathrm{11}}^2\times {\mathrm{31}}^1\times {\mathrm{761}}^1$

素因数の和:821

約数の個数: 24

約数和(自身を含む): 25944576

約数和(自身を除く): 5962999

約数列:

[1, 7, 11, 31, 77, 121, 217, 341, 761, 847, 2387, 3751, 5327, 8371, 23591, 26257, 58597, 92081, 165137, 259501, 644567, 1816507, 2854511, 19981577]

約数ペア:

[(1, 19981577), (7, 2854511), (11, 1816507), (31, 644567), (77, 259501), (121, 165137), (217, 92081), (341, 58597), (761, 26257), (847, 23591), (2387, 8371), (3751, 5327)]