19889779

素因数分解:

$7^1\times {\mathrm{13}}^2\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{43}}^1$

素因数の和:116

約数の個数: 48

約数和(自身を含む): 27827712

約数和(自身を除く): 7937933

約数列:

[1, 7, 13, 17, 23, 43, 91, 119, 161, 169, 221, 299, 301, 391, 559, 731, 989, 1183, 1547, 2093, 2737, 2873, 3887, 3913, 5083, 5117, 6923, 7267, 9503, 12857, 16813, 20111, 27209, 35581, 50869, 66079, 66521, 89999, 117691, 123539, 167141, 218569, 462553, 864773, 1169987, 1529983, 2841397, 19889779]

約数ペア:

[(1, 19889779), (7, 2841397), (13, 1529983), (17, 1169987), (23, 864773), (43, 462553), (91, 218569), (119, 167141), (161, 123539), (169, 117691), (221, 89999), (299, 66521), (301, 66079), (391, 50869), (559, 35581), (731, 27209), (989, 20111), (1183, 16813), (1547, 12857), (2093, 9503), (2737, 7267), (2873, 6923), (3887, 5117), (3913, 5083)]