21013405

素因数分解:

$5^1\times 7^2\times {\mathrm{199}}^1\times {\mathrm{431}}^1$

素因数の和:649

約数の個数: 24

約数和(自身を含む): 29548800

約数和(自身を除く): 8535395

約数列:

[1, 5, 7, 35, 49, 199, 245, 431, 995, 1393, 2155, 3017, 6965, 9751, 15085, 21119, 48755, 85769, 105595, 428845, 600383, 3001915, 4202681, 21013405]

約数ペア:

[(1, 21013405), (5, 4202681), (7, 3001915), (35, 600383), (49, 428845), (199, 105595), (245, 85769), (431, 48755), (995, 21119), (1393, 15085), (2155, 9751), (3017, 6965)]