21680915

素因数分解:

$5^1\times {\mathrm{71}}^1\times {\mathrm{157}}^1\times {\mathrm{389}}^1$

素因数の和:622

約数の個数: 16

約数和(自身を含む): 26619840

約数和(自身を除く): 4938925

約数列:

[1, 5, 71, 157, 355, 389, 785, 1945, 11147, 27619, 55735, 61073, 138095, 305365, 4336183, 21680915]

約数ペア:

[(1, 21680915), (5, 4336183), (71, 305365), (157, 138095), (355, 61073), (389, 55735), (785, 27619), (1945, 11147)]