21407540

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{11}}^1\times {\mathrm{13901}}^1$

素因数の和:13928

約数の個数: 48

約数和(自身を含む): 56052864

約数和(自身を除く): 34645324

約数列:

[1, 2, 4, 5, 7, 10, 11, 14, 20, 22, 28, 35, 44, 55, 70, 77, 110, 140, 154, 220, 308, 385, 770, 1540, 13901, 27802, 55604, 69505, 97307, 139010, 152911, 194614, 278020, 305822, 389228, 486535, 611644, 764555, 973070, 1070377, 1529110, 1946140, 2140754, 3058220, 4281508, 5351885, 10703770, 21407540]

約数ペア:

[(1, 21407540), (2, 10703770), (4, 5351885), (5, 4281508), (7, 3058220), (10, 2140754), (11, 1946140), (14, 1529110), (20, 1070377), (22, 973070), (28, 764555), (35, 611644), (44, 486535), (55, 389228), (70, 305822), (77, 278020), (110, 194614), (140, 152911), (154, 139010), (220, 97307), (308, 69505), (385, 55604), (770, 27802), (1540, 13901)]