20511491

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{661}}^1$

素因数の和:723

約数の個数: 32

約数和(自身を含む): 28471296

約数和(自身を除く): 7959805

約数列:

[1, 7, 11, 13, 31, 77, 91, 143, 217, 341, 403, 661, 1001, 2387, 2821, 4433, 4627, 7271, 8593, 20491, 31031, 50897, 60151, 94523, 143437, 225401, 266383, 661661, 1577807, 1864681, 2930213, 20511491]

約数ペア:

[(1, 20511491), (7, 2930213), (11, 1864681), (13, 1577807), (31, 661661), (77, 266383), (91, 225401), (143, 143437), (217, 94523), (341, 60151), (403, 50897), (661, 31031), (1001, 20491), (2387, 8593), (2821, 7271), (4433, 4627)]