19901917

素因数分解:

$7^1\times {\mathrm{17}}^1\times {\mathrm{29}}^1\times {\mathrm{73}}^1\times {\mathrm{79}}^1$

素因数の和:205

約数の個数: 32

約数和(自身を含む): 25574400

約数和(自身を除く): 5672483

約数列:

[1, 7, 17, 29, 73, 79, 119, 203, 493, 511, 553, 1241, 1343, 2117, 2291, 3451, 5767, 8687, 9401, 14819, 16037, 35989, 38947, 40369, 98039, 167243, 251923, 272629, 686273, 1170701, 2843131, 19901917]

約数ペア:

[(1, 19901917), (7, 2843131), (17, 1170701), (29, 686273), (73, 272629), (79, 251923), (119, 167243), (203, 98039), (493, 40369), (511, 38947), (553, 35989), (1241, 16037), (1343, 14819), (2117, 9401), (2291, 8687), (3451, 5767)]