18920447

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{31}}^1\times {\mathrm{353}}^1$

素因数の和:423

約数の個数: 32

約数和(自身を含む): 25374720

約数和(自身を除く): 6454273

約数列:

[1, 7, 13, 19, 31, 91, 133, 217, 247, 353, 403, 589, 1729, 2471, 2821, 4123, 4589, 6707, 7657, 10943, 32123, 46949, 53599, 76601, 87191, 142259, 207917, 610337, 995813, 1455419, 2702921, 18920447]

約数ペア:

[(1, 18920447), (7, 2702921), (13, 1455419), (19, 995813), (31, 610337), (91, 207917), (133, 142259), (217, 87191), (247, 76601), (353, 53599), (403, 46949), (589, 32123), (1729, 10943), (2471, 7657), (2821, 6707), (4123, 4589)]