20421947

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{43}}^1\times {\mathrm{307}}^1$

素因数の和:387

約数の個数: 32

約数和(自身を含む): 27320832

約数和(自身を除く): 6898885

約数列:

[1, 7, 13, 17, 43, 91, 119, 221, 301, 307, 559, 731, 1547, 2149, 3913, 3991, 5117, 5219, 9503, 13201, 27937, 36533, 66521, 67847, 92407, 171613, 224417, 474929, 1201291, 1570919, 2917421, 20421947]

約数ペア:

[(1, 20421947), (7, 2917421), (13, 1570919), (17, 1201291), (43, 474929), (91, 224417), (119, 171613), (221, 92407), (301, 67847), (307, 66521), (559, 36533), (731, 27937), (1547, 13201), (2149, 9503), (3913, 5219), (3991, 5117)]