21391888

素因数分解:

$2^4\times 7^1\times {\mathrm{389}}^1\times {\mathrm{491}}^1$

素因数の和:895

約数の個数: 40

約数和(自身を含む): 47586240

約数和(自身を除く): 26194352

約数列:

[1, 2, 4, 7, 8, 14, 16, 28, 56, 112, 389, 491, 778, 982, 1556, 1964, 2723, 3112, 3437, 3928, 5446, 6224, 6874, 7856, 10892, 13748, 21784, 27496, 43568, 54992, 190999, 381998, 763996, 1336993, 1527992, 2673986, 3055984, 5347972, 10695944, 21391888]

約数ペア:

[(1, 21391888), (2, 10695944), (4, 5347972), (7, 3055984), (8, 2673986), (14, 1527992), (16, 1336993), (28, 763996), (56, 381998), (112, 190999), (389, 54992), (491, 43568), (778, 27496), (982, 21784), (1556, 13748), (1964, 10892), (2723, 7856), (3112, 6874), (3437, 6224), (3928, 5446)]