21509719

素因数分解:

$7^1\times {\mathrm{11}}^1\times {\mathrm{409}}^1\times {\mathrm{683}}^1$

素因数の和:1110

約数の個数: 16

約数和(自身を含む): 26922240

約数和(自身を除く): 5412521

約数列:

[1, 7, 11, 77, 409, 683, 2863, 4499, 4781, 7513, 31493, 52591, 279347, 1955429, 3072817, 21509719]

約数ペア:

[(1, 21509719), (7, 3072817), (11, 1955429), (77, 279347), (409, 52591), (683, 31493), (2863, 7513), (4499, 4781)]