21042080

素因数分解:

$2^5\times 5^1\times {\mathrm{347}}^1\times {\mathrm{379}}^1$

素因数の和:741

約数の個数: 48

約数和(自身を含む): 49986720

約数和(自身を除く): 28944640

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 160, 347, 379, 694, 758, 1388, 1516, 1735, 1895, 2776, 3032, 3470, 3790, 5552, 6064, 6940, 7580, 11104, 12128, 13880, 15160, 27760, 30320, 55520, 60640, 131513, 263026, 526052, 657565, 1052104, 1315130, 2104208, 2630260, 4208416, 5260520, 10521040, 21042080]

約数ペア:

[(1, 21042080), (2, 10521040), (4, 5260520), (5, 4208416), (8, 2630260), (10, 2104208), (16, 1315130), (20, 1052104), (32, 657565), (40, 526052), (80, 263026), (160, 131513), (347, 60640), (379, 55520), (694, 30320), (758, 27760), (1388, 15160), (1516, 13880), (1735, 12128), (1895, 11104), (2776, 7580), (3032, 6940), (3470, 6064), (3790, 5552)]