19919081

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{31}}^1\times {\mathrm{307}}^1$

素因数の和:381

約数の個数: 32

約数和(自身を含む): 26492928

約数和(自身を除く): 6573847

約数列:

[1, 7, 13, 23, 31, 91, 161, 217, 299, 307, 403, 713, 2093, 2149, 2821, 3991, 4991, 7061, 9269, 9517, 27937, 49427, 64883, 66619, 91793, 123721, 218891, 642551, 866047, 1532237, 2845583, 19919081]

約数ペア:

[(1, 19919081), (7, 2845583), (13, 1532237), (23, 866047), (31, 642551), (91, 218891), (161, 123721), (217, 91793), (299, 66619), (307, 64883), (403, 49427), (713, 27937), (2093, 9517), (2149, 9269), (2821, 7061), (3991, 4991)]