19980895

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{11719}}^1$

素因数の和:11766

約数の個数: 16

約数和(自身を含む): 27002880

約数和(自身を除く): 7021985

約数列:

[1, 5, 11, 31, 55, 155, 341, 1705, 11719, 58595, 128909, 363289, 644545, 1816445, 3996179, 19980895]

約数ペア:

[(1, 19980895), (5, 3996179), (11, 1816445), (31, 644545), (55, 363289), (155, 128909), (341, 58595), (1705, 11719)]