21428253

素因数分解:

$3^3\times 7^1\times {\mathrm{11}}^2\times {\mathrm{937}}^1$

素因数の和:975

約数の個数: 48

約数和(自身を含む): 39921280

約数和(自身を除く): 18493027

約数列:

[1, 3, 7, 9, 11, 21, 27, 33, 63, 77, 99, 121, 189, 231, 297, 363, 693, 847, 937, 1089, 2079, 2541, 2811, 3267, 6559, 7623, 8433, 10307, 19677, 22869, 25299, 30921, 59031, 72149, 92763, 113377, 177093, 216447, 278289, 340131, 649341, 793639, 1020393, 1948023, 2380917, 3061179, 7142751, 21428253]

約数ペア:

[(1, 21428253), (3, 7142751), (7, 3061179), (9, 2380917), (11, 1948023), (21, 1020393), (27, 793639), (33, 649341), (63, 340131), (77, 278289), (99, 216447), (121, 177093), (189, 113377), (231, 92763), (297, 72149), (363, 59031), (693, 30921), (847, 25299), (937, 22869), (1089, 19677), (2079, 10307), (2541, 8433), (2811, 7623), (3267, 6559)]