21011815

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{20107}}^1$

素因数の和:20142

約数の個数: 16

約数和(自身を含む): 28955520

約数和(自身を除く): 7943705

約数列:

[1, 5, 11, 19, 55, 95, 209, 1045, 20107, 100535, 221177, 382033, 1105885, 1910165, 4202363, 21011815]

約数ペア:

[(1, 21011815), (5, 4202363), (11, 1910165), (19, 1105885), (55, 382033), (95, 221177), (209, 100535), (1045, 20107)]