21043540

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{109}}^1\times {\mathrm{197}}^1$

素因数の和:329

約数の個数: 72

約数和(自身を含む): 52141320

約数和(自身を除く): 31097780

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 49, 70, 98, 109, 140, 196, 197, 218, 245, 394, 436, 490, 545, 763, 788, 980, 985, 1090, 1379, 1526, 1970, 2180, 2758, 3052, 3815, 3940, 5341, 5516, 6895, 7630, 9653, 10682, 13790, 15260, 19306, 21364, 21473, 26705, 27580, 38612, 42946, 48265, 53410, 85892, 96530, 106820, 107365, 150311, 193060, 214730, 300622, 429460, 601244, 751555, 1052177, 1503110, 2104354, 3006220, 4208708, 5260885, 10521770, 21043540]

約数ペア:

[(1, 21043540), (2, 10521770), (4, 5260885), (5, 4208708), (7, 3006220), (10, 2104354), (14, 1503110), (20, 1052177), (28, 751555), (35, 601244), (49, 429460), (70, 300622), (98, 214730), (109, 193060), (140, 150311), (196, 107365), (197, 106820), (218, 96530), (245, 85892), (394, 53410), (436, 48265), (490, 42946), (545, 38612), (763, 27580), (788, 26705), (980, 21473), (985, 21364), (1090, 19306), (1379, 15260), (1526, 13790), (1970, 10682), (2180, 9653), (2758, 7630), (3052, 6895), (3815, 5516), (3940, 5341)]