20997459

素因数分解:

$3^2\times 7^1\times {\mathrm{23}}^1\times {\mathrm{43}}^1\times {\mathrm{337}}^1$

素因数の和:416

約数の個数: 48

約数和(自身を含む): 37120512

約数和(自身を除く): 16123053

約数列:

[1, 3, 7, 9, 21, 23, 43, 63, 69, 129, 161, 207, 301, 337, 387, 483, 903, 989, 1011, 1449, 2359, 2709, 2967, 3033, 6923, 7077, 7751, 8901, 14491, 20769, 21231, 23253, 43473, 54257, 62307, 69759, 101437, 130419, 162771, 304311, 333293, 488313, 912933, 999879, 2333051, 2999637, 6999153, 20997459]

約数ペア:

[(1, 20997459), (3, 6999153), (7, 2999637), (9, 2333051), (21, 999879), (23, 912933), (43, 488313), (63, 333293), (69, 304311), (129, 162771), (161, 130419), (207, 101437), (301, 69759), (337, 62307), (387, 54257), (483, 43473), (903, 23253), (989, 21231), (1011, 20769), (1449, 14491), (2359, 8901), (2709, 7751), (2967, 7077), (3033, 6923)]