21015519

素因数分解:

$3^1\times 7^1\times {\mathrm{17}}^1\times {\mathrm{37}}^2\times {\mathrm{43}}^1$

素因数の和:144

約数の個数: 48

約数和(自身を含む): 35659008

約数和(自身を除く): 14643489

約数列:

[1, 3, 7, 17, 21, 37, 43, 51, 111, 119, 129, 259, 301, 357, 629, 731, 777, 903, 1369, 1591, 1887, 2193, 4107, 4403, 4773, 5117, 9583, 11137, 13209, 15351, 23273, 27047, 28749, 33411, 58867, 69819, 81141, 162911, 176601, 189329, 412069, 488733, 567987, 1000739, 1236207, 3002217, 7005173, 21015519]

約数ペア:

[(1, 21015519), (3, 7005173), (7, 3002217), (17, 1236207), (21, 1000739), (37, 567987), (43, 488733), (51, 412069), (111, 189329), (119, 176601), (129, 162911), (259, 81141), (301, 69819), (357, 58867), (629, 33411), (731, 28749), (777, 27047), (903, 23273), (1369, 15351), (1591, 13209), (1887, 11137), (2193, 9583), (4107, 5117), (4403, 4773)]