21081380

素因数分解:

$2^2\times 5^1\times {\mathrm{41}}^1\times {\mathrm{47}}^1\times {\mathrm{547}}^1$

素因数の和:644

約数の個数: 48

約数和(自身を含む): 46400256

約数和(自身を除く): 25318876

約数列:

[1, 2, 4, 5, 10, 20, 41, 47, 82, 94, 164, 188, 205, 235, 410, 470, 547, 820, 940, 1094, 1927, 2188, 2735, 3854, 5470, 7708, 9635, 10940, 19270, 22427, 25709, 38540, 44854, 51418, 89708, 102836, 112135, 128545, 224270, 257090, 448540, 514180, 1054069, 2108138, 4216276, 5270345, 10540690, 21081380]

約数ペア:

[(1, 21081380), (2, 10540690), (4, 5270345), (5, 4216276), (10, 2108138), (20, 1054069), (41, 514180), (47, 448540), (82, 257090), (94, 224270), (164, 128545), (188, 112135), (205, 102836), (235, 89708), (410, 51418), (470, 44854), (547, 38540), (820, 25709), (940, 22427), (1094, 19270), (1927, 10940), (2188, 9635), (2735, 7708), (3854, 5470)]