21129520

素因数分解:

$2^4\times 5^1\times {\mathrm{19}}^1\times {\mathrm{13901}}^1$

素因数の和:13933

約数の個数: 40

約数和(自身を含む): 51715440

約数和(自身を除く): 30585920

約数列:

[1, 2, 4, 5, 8, 10, 16, 19, 20, 38, 40, 76, 80, 95, 152, 190, 304, 380, 760, 1520, 13901, 27802, 55604, 69505, 111208, 139010, 222416, 264119, 278020, 528238, 556040, 1056476, 1112080, 1320595, 2112952, 2641190, 4225904, 5282380, 10564760, 21129520]

約数ペア:

[(1, 21129520), (2, 10564760), (4, 5282380), (5, 4225904), (8, 2641190), (10, 2112952), (16, 1320595), (19, 1112080), (20, 1056476), (38, 556040), (40, 528238), (76, 278020), (80, 264119), (95, 222416), (152, 139010), (190, 111208), (304, 69505), (380, 55604), (760, 27802), (1520, 13901)]