21290418

素因数分解:

$2^1\times 3^3\times {\mathrm{43}}^1\times {\mathrm{53}}^1\times {\mathrm{173}}^1$

素因数の和:280

約数の個数: 64

約数和(自身を含む): 49610880

約数和(自身を除く): 28320462

約数列:

[1, 2, 3, 6, 9, 18, 27, 43, 53, 54, 86, 106, 129, 159, 173, 258, 318, 346, 387, 477, 519, 774, 954, 1038, 1161, 1431, 1557, 2279, 2322, 2862, 3114, 4558, 4671, 6837, 7439, 9169, 9342, 13674, 14878, 18338, 20511, 22317, 27507, 41022, 44634, 55014, 61533, 66951, 82521, 123066, 133902, 165042, 200853, 247563, 394267, 401706, 495126, 788534, 1182801, 2365602, 3548403, 7096806, 10645209, 21290418]

約数ペア:

[(1, 21290418), (2, 10645209), (3, 7096806), (6, 3548403), (9, 2365602), (18, 1182801), (27, 788534), (43, 495126), (53, 401706), (54, 394267), (86, 247563), (106, 200853), (129, 165042), (159, 133902), (173, 123066), (258, 82521), (318, 66951), (346, 61533), (387, 55014), (477, 44634), (519, 41022), (774, 27507), (954, 22317), (1038, 20511), (1161, 18338), (1431, 14878), (1557, 13674), (2279, 9342), (2322, 9169), (2862, 7439), (3114, 6837), (4558, 4671)]