21399745

素因数分解:

$5^1\times {\mathrm{41}}^1\times {\mathrm{139}}^1\times {\mathrm{751}}^1$

素因数の和:936

約数の個数: 16

約数和(自身を含む): 26530560

約数和(自身を除く): 5130815

約数列:

[1, 5, 41, 139, 205, 695, 751, 3755, 5699, 28495, 30791, 104389, 153955, 521945, 4279949, 21399745]

約数ペア:

[(1, 21399745), (5, 4279949), (41, 521945), (139, 153955), (205, 104389), (695, 30791), (751, 28495), (3755, 5699)]