21065005

素因数分解:

$5^1\times {\mathrm{13}}^2\times {\mathrm{97}}^1\times {\mathrm{257}}^1$

素因数の和:385

約数の個数: 24

約数和(自身を含む): 27761832

約数和(自身を除く): 6696827

約数列:

[1, 5, 13, 65, 97, 169, 257, 485, 845, 1261, 1285, 3341, 6305, 16393, 16705, 24929, 43433, 81965, 124645, 217165, 324077, 1620385, 4213001, 21065005]

約数ペア:

[(1, 21065005), (5, 4213001), (13, 1620385), (65, 324077), (97, 217165), (169, 124645), (257, 81965), (485, 43433), (845, 24929), (1261, 16705), (1285, 16393), (3341, 6305)]