21248720

素因数分解:

$2^4\times 5^1\times {\mathrm{151}}^1\times {\mathrm{1759}}^1$

素因数の和:1923

約数の個数: 40

約数和(自身を含む): 49758720

約数和(自身を除く): 28510000

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 151, 302, 604, 755, 1208, 1510, 1759, 2416, 3020, 3518, 6040, 7036, 8795, 12080, 14072, 17590, 28144, 35180, 70360, 140720, 265609, 531218, 1062436, 1328045, 2124872, 2656090, 4249744, 5312180, 10624360, 21248720]

約数ペア:

[(1, 21248720), (2, 10624360), (4, 5312180), (5, 4249744), (8, 2656090), (10, 2124872), (16, 1328045), (20, 1062436), (40, 531218), (80, 265609), (151, 140720), (302, 70360), (604, 35180), (755, 28144), (1208, 17590), (1510, 14072), (1759, 12080), (2416, 8795), (3020, 7036), (3518, 6040)]