21139805

素因数分解:

$5^1\times {\mathrm{41}}^1\times {\mathrm{101}}^1\times {\mathrm{1021}}^1$

素因数の和:1168

約数の個数: 16

約数和(自身を含む): 26269488

約数和(自身を除く): 5129683

約数列:

[1, 5, 41, 101, 205, 505, 1021, 4141, 5105, 20705, 41861, 103121, 209305, 515605, 4227961, 21139805]

約数ペア:

[(1, 21139805), (5, 4227961), (41, 515605), (101, 209305), (205, 103121), (505, 41861), (1021, 20705), (4141, 5105)]