21056959

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{37}}^1\times {\mathrm{389}}^1$

素因数の和:463

約数の個数: 32

約数和(自身を含む): 28454400

約数和(自身を除く): 7397441

約数列:

[1, 7, 11, 19, 37, 77, 133, 209, 259, 389, 407, 703, 1463, 2723, 2849, 4279, 4921, 7391, 7733, 14393, 29953, 51737, 54131, 81301, 100751, 158323, 273467, 569107, 1108261, 1914269, 3008137, 21056959]

約数ペア:

[(1, 21056959), (7, 3008137), (11, 1914269), (19, 1108261), (37, 569107), (77, 273467), (133, 158323), (209, 100751), (259, 81301), (389, 54131), (407, 51737), (703, 29953), (1463, 14393), (2723, 7733), (2849, 7391), (4279, 4921)]