19980027

素因数分解:

$3^4\times {\mathrm{31}}^1\times {\mathrm{73}}^1\times {\mathrm{109}}^1$

素因数の和:225

約数の個数: 40

約数和(自身を含む): 31518080

約数和(自身を除く): 11538053

約数列:

[1, 3, 9, 27, 31, 73, 81, 93, 109, 219, 279, 327, 657, 837, 981, 1971, 2263, 2511, 2943, 3379, 5913, 6789, 7957, 8829, 10137, 20367, 23871, 30411, 61101, 71613, 91233, 183303, 214839, 246667, 273699, 644517, 740001, 2220003, 6660009, 19980027]

約数ペア:

[(1, 19980027), (3, 6660009), (9, 2220003), (27, 740001), (31, 644517), (73, 273699), (81, 246667), (93, 214839), (109, 183303), (219, 91233), (279, 71613), (327, 61101), (657, 30411), (837, 23871), (981, 20367), (1971, 10137), (2263, 8829), (2511, 7957), (2943, 6789), (3379, 5913)]