21661465

素因数分解:

$5^1\times 7^1\times {\mathrm{37}}^1\times {\mathrm{43}}^1\times {\mathrm{389}}^1$

素因数の和:481

約数の個数: 32

約数和(自身を含む): 31299840

約数和(自身を除く): 9638375

約数列:

[1, 5, 7, 35, 37, 43, 185, 215, 259, 301, 389, 1295, 1505, 1591, 1945, 2723, 7955, 11137, 13615, 14393, 16727, 55685, 71965, 83635, 100751, 117089, 503755, 585445, 618899, 3094495, 4332293, 21661465]

約数ペア:

[(1, 21661465), (5, 4332293), (7, 3094495), (35, 618899), (37, 585445), (43, 503755), (185, 117089), (215, 100751), (259, 83635), (301, 71965), (389, 55685), (1295, 16727), (1505, 14393), (1591, 13615), (1945, 11137), (2723, 7955)]