81021745

素因数分解:

$5^1\times 7^4\times {\mathrm{17}}^1\times {\mathrm{397}}^1$

素因数の和:447

約数の個数: 40

約数和(自身を含む): 120398184

約数和(自身を除く): 39376439

約数列:

[1, 5, 7, 17, 35, 49, 85, 119, 245, 343, 397, 595, 833, 1715, 1985, 2401, 2779, 4165, 5831, 6749, 12005, 13895, 19453, 29155, 33745, 40817, 47243, 97265, 136171, 204085, 236215, 330701, 680855, 953197, 1653505, 2314907, 4765985, 11574535, 16204349, 81021745]

約数ペア:

[(1, 81021745), (5, 16204349), (7, 11574535), (17, 4765985), (35, 2314907), (49, 1653505), (85, 953197), (119, 680855), (245, 330701), (343, 236215), (397, 204085), (595, 136171), (833, 97265), (1715, 47243), (1985, 40817), (2401, 33745), (2779, 29155), (4165, 19453), (5831, 13895), (6749, 12005)]