20903155

素因数分解:

$5^1\times 7^2\times {\mathrm{13}}^1\times {\mathrm{6563}}^1$

素因数の和:6595

約数の個数: 24

約数和(自身を含む): 31428432

約数和(自身を除く): 10525277

約数列:

[1, 5, 7, 13, 35, 49, 65, 91, 245, 455, 637, 3185, 6563, 32815, 45941, 85319, 229705, 321587, 426595, 597233, 1607935, 2986165, 4180631, 20903155]

約数ペア:

[(1, 20903155), (5, 4180631), (7, 2986165), (13, 1607935), (35, 597233), (49, 426595), (65, 321587), (91, 229705), (245, 85319), (455, 45941), (637, 32815), (3185, 6563)]