20928831

素因数分解:

$3^1\times 7^3\times {\mathrm{11}}^1\times {\mathrm{43}}^2$

素因数の和:121

約数の個数: 48

約数和(自身を含む): 36345600

約数和(自身を除く): 15416769

約数列:

[1, 3, 7, 11, 21, 33, 43, 49, 77, 129, 147, 231, 301, 343, 473, 539, 903, 1029, 1419, 1617, 1849, 2107, 3311, 3773, 5547, 6321, 9933, 11319, 12943, 14749, 20339, 23177, 38829, 44247, 61017, 69531, 90601, 142373, 162239, 271803, 427119, 486717, 634207, 996611, 1902621, 2989833, 6976277, 20928831]

約数ペア:

[(1, 20928831), (3, 6976277), (7, 2989833), (11, 1902621), (21, 996611), (33, 634207), (43, 486717), (49, 427119), (77, 271803), (129, 162239), (147, 142373), (231, 90601), (301, 69531), (343, 61017), (473, 44247), (539, 38829), (903, 23177), (1029, 20339), (1419, 14749), (1617, 12943), (1849, 11319), (2107, 9933), (3311, 6321), (3773, 5547)]