21561865

素因数分解:

$5^1\times {\mathrm{13}}^2\times {\mathrm{17}}^1\times {\mathrm{19}}^1\times {\mathrm{79}}^1$

素因数の和:146

約数の個数: 48

約数和(自身を含む): 31622400

約数和(自身を除く): 10060535

約数列:

[1, 5, 13, 17, 19, 65, 79, 85, 95, 169, 221, 247, 323, 395, 845, 1027, 1105, 1235, 1343, 1501, 1615, 2873, 3211, 4199, 5135, 6715, 7505, 13351, 14365, 16055, 17459, 19513, 20995, 25517, 54587, 66755, 87295, 97565, 127585, 226967, 253669, 272935, 331721, 1134835, 1268345, 1658605, 4312373, 21561865]

約数ペア:

[(1, 21561865), (5, 4312373), (13, 1658605), (17, 1268345), (19, 1134835), (65, 331721), (79, 272935), (85, 253669), (95, 226967), (169, 127585), (221, 97565), (247, 87295), (323, 66755), (395, 54587), (845, 25517), (1027, 20995), (1105, 19513), (1235, 17459), (1343, 16055), (1501, 14365), (1615, 13351), (2873, 7505), (3211, 6715), (4199, 5135)]