19780805

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{23}}^1\times {\mathrm{823}}^1$

素因数の和:881

約数の個数: 32

約数和(自身を含む): 28477440

約数和(自身を除く): 8696635

約数列:

[1, 5, 11, 19, 23, 55, 95, 115, 209, 253, 437, 823, 1045, 1265, 2185, 4115, 4807, 9053, 15637, 18929, 24035, 45265, 78185, 94645, 172007, 208219, 359651, 860035, 1041095, 1798255, 3956161, 19780805]

約数ペア:

[(1, 19780805), (5, 3956161), (11, 1798255), (19, 1041095), (23, 860035), (55, 359651), (95, 208219), (115, 172007), (209, 94645), (253, 78185), (437, 45265), (823, 24035), (1045, 18929), (1265, 15637), (2185, 9053), (4115, 4807)]