19740721

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^2\times {\mathrm{37}}^1\times {\mathrm{41}}^1$

素因数の和:122

約数の個数: 48

約数和(自身を含む): 28038528

約数和(自身を除く): 8297807

約数列:

[1, 7, 11, 13, 37, 41, 77, 91, 143, 169, 259, 287, 407, 451, 481, 533, 1001, 1183, 1517, 1859, 2849, 3157, 3367, 3731, 5291, 5863, 6253, 6929, 10619, 13013, 16687, 19721, 37037, 41041, 43771, 48503, 68783, 76219, 116809, 138047, 216931, 256373, 481481, 533533, 1518517, 1794611, 2820103, 19740721]

約数ペア:

[(1, 19740721), (7, 2820103), (11, 1794611), (13, 1518517), (37, 533533), (41, 481481), (77, 256373), (91, 216931), (143, 138047), (169, 116809), (259, 76219), (287, 68783), (407, 48503), (451, 43771), (481, 41041), (533, 37037), (1001, 19721), (1183, 16687), (1517, 13013), (1859, 10619), (2849, 6929), (3157, 6253), (3367, 5863), (3731, 5291)]