21181655

素因数分解:

$5^1\times {\mathrm{11}}^2\times {\mathrm{157}}^1\times {\mathrm{223}}^1$

素因数の和:407

約数の個数: 24

約数和(自身を含む): 28242816

約数和(自身を除く): 7061161

約数列:

[1, 5, 11, 55, 121, 157, 223, 605, 785, 1115, 1727, 2453, 8635, 12265, 18997, 26983, 35011, 94985, 134915, 175055, 385121, 1925605, 4236331, 21181655]

約数ペア:

[(1, 21181655), (5, 4236331), (11, 1925605), (55, 385121), (121, 175055), (157, 134915), (223, 94985), (605, 35011), (785, 26983), (1115, 18997), (1727, 12265), (2453, 8635)]