20987281

素因数分解:

$7^1\times {\mathrm{67}}^1\times {\mathrm{73}}^1\times {\mathrm{613}}^1$

素因数の和:760

約数の個数: 16

約数和(自身を含む): 24717184

約数和(自身を除く): 3729903

約数列:

[1, 7, 67, 73, 469, 511, 613, 4291, 4891, 34237, 41071, 44749, 287497, 313243, 2998183, 20987281]

約数ペア:

[(1, 20987281), (7, 2998183), (67, 313243), (73, 287497), (469, 44749), (511, 41071), (613, 34237), (4291, 4891)]