21815247

素因数分解:

$3^1\times {\mathrm{23}}^1\times {\mathrm{61}}^1\times {\mathrm{71}}^1\times {\mathrm{73}}^1$

素因数の和:231

約数の個数: 32

約数和(自身を含む): 31712256

約数和(自身を除く): 9897009

約数列:

[1, 3, 23, 61, 69, 71, 73, 183, 213, 219, 1403, 1633, 1679, 4209, 4331, 4453, 4899, 5037, 5183, 12993, 13359, 15549, 99613, 102419, 119209, 298839, 307257, 316163, 357627, 948489, 7271749, 21815247]

約数ペア:

[(1, 21815247), (3, 7271749), (23, 948489), (61, 357627), (69, 316163), (71, 307257), (73, 298839), (183, 119209), (213, 102419), (219, 99613), (1403, 15549), (1633, 13359), (1679, 12993), (4209, 5183), (4331, 5037), (4453, 4899)]