21005545

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{20101}}^1$

素因数の和:20136

約数の個数: 16

約数和(自身を含む): 28946880

約数和(自身を除く): 7941335

約数列:

[1, 5, 11, 19, 55, 95, 209, 1045, 20101, 100505, 221111, 381919, 1105555, 1909595, 4201109, 21005545]

約数ペア:

[(1, 21005545), (5, 4201109), (11, 1909595), (19, 1105555), (55, 381919), (95, 221111), (209, 100505), (1045, 20101)]