21420080

素因数分解:

$2^4\times 5^1\times {\mathrm{11}}^1\times {\mathrm{101}}^1\times {\mathrm{241}}^1$

素因数の和:366

約数の個数: 80

約数和(自身を含む): 55094688

約数和(自身を除く): 33674608

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 40, 44, 55, 80, 88, 101, 110, 176, 202, 220, 241, 404, 440, 482, 505, 808, 880, 964, 1010, 1111, 1205, 1616, 1928, 2020, 2222, 2410, 2651, 3856, 4040, 4444, 4820, 5302, 5555, 8080, 8888, 9640, 10604, 11110, 13255, 17776, 19280, 21208, 22220, 24341, 26510, 42416, 44440, 48682, 53020, 88880, 97364, 106040, 121705, 194728, 212080, 243410, 267751, 389456, 486820, 535502, 973640, 1071004, 1338755, 1947280, 2142008, 2677510, 4284016, 5355020, 10710040, 21420080]

約数ペア:

[(1, 21420080), (2, 10710040), (4, 5355020), (5, 4284016), (8, 2677510), (10, 2142008), (11, 1947280), (16, 1338755), (20, 1071004), (22, 973640), (40, 535502), (44, 486820), (55, 389456), (80, 267751), (88, 243410), (101, 212080), (110, 194728), (176, 121705), (202, 106040), (220, 97364), (241, 88880), (404, 53020), (440, 48682), (482, 44440), (505, 42416), (808, 26510), (880, 24341), (964, 22220), (1010, 21208), (1111, 19280), (1205, 17776), (1616, 13255), (1928, 11110), (2020, 10604), (2222, 9640), (2410, 8888), (2651, 8080), (3856, 5555), (4040, 5302), (4444, 4820)]