20939247

素因数分解:

$3^2\times 7^1\times {\mathrm{29}}^1\times {\mathrm{73}}^1\times {\mathrm{157}}^1$

素因数の和:272

約数の個数: 48

約数和(自身を含む): 36479040

約数和(自身を除く): 15539793

約数列:

[1, 3, 7, 9, 21, 29, 63, 73, 87, 157, 203, 219, 261, 471, 511, 609, 657, 1099, 1413, 1533, 1827, 2117, 3297, 4553, 4599, 6351, 9891, 11461, 13659, 14819, 19053, 31871, 34383, 40977, 44457, 80227, 95613, 103149, 133371, 240681, 286839, 332369, 722043, 997107, 2326583, 2991321, 6979749, 20939247]

約数ペア:

[(1, 20939247), (3, 6979749), (7, 2991321), (9, 2326583), (21, 997107), (29, 722043), (63, 332369), (73, 286839), (87, 240681), (157, 133371), (203, 103149), (219, 95613), (261, 80227), (471, 44457), (511, 40977), (609, 34383), (657, 31871), (1099, 19053), (1413, 14819), (1533, 13659), (1827, 11461), (2117, 9891), (3297, 6351), (4553, 4599)]