21361790

素因数分解:

$2^1\times 5^1\times {\mathrm{31}}^1\times {\mathrm{68909}}^1$

素因数の和:68947

約数の個数: 16

約数和(自身を含む): 39692160

約数和(自身を除く): 18330370

約数列:

[1, 2, 5, 10, 31, 62, 155, 310, 68909, 137818, 344545, 689090, 2136179, 4272358, 10680895, 21361790]

約数ペア:

[(1, 21361790), (2, 10680895), (5, 4272358), (10, 2136179), (31, 689090), (62, 344545), (155, 137818), (310, 68909)]