21000133

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{223}}^1\times {\mathrm{1223}}^1$

素因数の和:1464

約数の個数: 16

約数和(自身を含む): 26320896

約数和(自身を除く): 5320763

約数列:

[1, 7, 11, 77, 223, 1223, 1561, 2453, 8561, 13453, 17171, 94171, 272729, 1909103, 3000019, 21000133]

約数ペア:

[(1, 21000133), (7, 3000019), (11, 1909103), (77, 272729), (223, 94171), (1223, 17171), (1561, 13453), (2453, 8561)]