21240520

素因数分解:

$2^3\times 5^1\times 7^2\times {\mathrm{10837}}^1$

素因数の和:10862

約数の個数: 48

約数和(自身を含む): 55598940

約数和(自身を除く): 34358420

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 49, 56, 70, 98, 140, 196, 245, 280, 392, 490, 980, 1960, 10837, 21674, 43348, 54185, 75859, 86696, 108370, 151718, 216740, 303436, 379295, 433480, 531013, 606872, 758590, 1062026, 1517180, 2124052, 2655065, 3034360, 4248104, 5310130, 10620260, 21240520]

約数ペア:

[(1, 21240520), (2, 10620260), (4, 5310130), (5, 4248104), (7, 3034360), (8, 2655065), (10, 2124052), (14, 1517180), (20, 1062026), (28, 758590), (35, 606872), (40, 531013), (49, 433480), (56, 379295), (70, 303436), (98, 216740), (140, 151718), (196, 108370), (245, 86696), (280, 75859), (392, 54185), (490, 43348), (980, 21674), (1960, 10837)]