20004880

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{139}}^1\times {\mathrm{257}}^1$

素因数の和:416

約数の個数: 80

約数和(自身を含む): 53746560

約数和(自身を除く): 33741680

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 56, 70, 80, 112, 139, 140, 257, 278, 280, 514, 556, 560, 695, 973, 1028, 1112, 1285, 1390, 1799, 1946, 2056, 2224, 2570, 2780, 3598, 3892, 4112, 4865, 5140, 5560, 7196, 7784, 8995, 9730, 10280, 11120, 14392, 15568, 17990, 19460, 20560, 28784, 35723, 35980, 38920, 71446, 71960, 77840, 142892, 143920, 178615, 250061, 285784, 357230, 500122, 571568, 714460, 1000244, 1250305, 1428920, 2000488, 2500610, 2857840, 4000976, 5001220, 10002440, 20004880]

約数ペア:

[(1, 20004880), (2, 10002440), (4, 5001220), (5, 4000976), (7, 2857840), (8, 2500610), (10, 2000488), (14, 1428920), (16, 1250305), (20, 1000244), (28, 714460), (35, 571568), (40, 500122), (56, 357230), (70, 285784), (80, 250061), (112, 178615), (139, 143920), (140, 142892), (257, 77840), (278, 71960), (280, 71446), (514, 38920), (556, 35980), (560, 35723), (695, 28784), (973, 20560), (1028, 19460), (1112, 17990), (1285, 15568), (1390, 14392), (1799, 11120), (1946, 10280), (2056, 9730), (2224, 8995), (2570, 7784), (2780, 7196), (3598, 5560), (3892, 5140), (4112, 4865)]