20802215

素因数分解:

$5^1\times 7^2\times {\mathrm{197}}^1\times {\mathrm{431}}^1$

素因数の和:647

約数の個数: 24

約数和(自身を含む): 29253312

約数和(自身を除く): 8451097

約数列:

[1, 5, 7, 35, 49, 197, 245, 431, 985, 1379, 2155, 3017, 6895, 9653, 15085, 21119, 48265, 84907, 105595, 424535, 594349, 2971745, 4160443, 20802215]

約数ペア:

[(1, 20802215), (5, 4160443), (7, 2971745), (35, 594349), (49, 424535), (197, 105595), (245, 84907), (431, 48265), (985, 21119), (1379, 15085), (2155, 9653), (3017, 6895)]