20257237

素因数分解:

$7^4\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{59}}^1$

素因数の和:111

約数の個数: 40

約数和(自身を含む): 28234080

約数和(自身を除く): 7976843

約数列:

[1, 7, 11, 13, 49, 59, 77, 91, 143, 343, 413, 539, 637, 649, 767, 1001, 2401, 2891, 3773, 4459, 4543, 5369, 7007, 8437, 20237, 26411, 31213, 31801, 37583, 49049, 59059, 141659, 222607, 263081, 343343, 413413, 1558249, 1841567, 2893891, 20257237]

約数ペア:

[(1, 20257237), (7, 2893891), (11, 1841567), (13, 1558249), (49, 413413), (59, 343343), (77, 263081), (91, 222607), (143, 141659), (343, 59059), (413, 49049), (539, 37583), (637, 31801), (649, 31213), (767, 26411), (1001, 20237), (2401, 8437), (2891, 7007), (3773, 5369), (4459, 4543)]