21120260

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{257}}^1\times {\mathrm{587}}^1$

素因数の和:860

約数の個数: 48

約数和(自身を含む): 50972544

約数和(自身を除く): 29852284

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140, 257, 514, 587, 1028, 1174, 1285, 1799, 2348, 2570, 2935, 3598, 4109, 5140, 5870, 7196, 8218, 8995, 11740, 16436, 17990, 20545, 35980, 41090, 82180, 150859, 301718, 603436, 754295, 1056013, 1508590, 2112026, 3017180, 4224052, 5280065, 10560130, 21120260]

約数ペア:

[(1, 21120260), (2, 10560130), (4, 5280065), (5, 4224052), (7, 3017180), (10, 2112026), (14, 1508590), (20, 1056013), (28, 754295), (35, 603436), (70, 301718), (140, 150859), (257, 82180), (514, 41090), (587, 35980), (1028, 20545), (1174, 17990), (1285, 16436), (1799, 11740), (2348, 8995), (2570, 8218), (2935, 7196), (3598, 5870), (4109, 5140)]