21815755

素因数分解:

$5^1\times {\mathrm{13}}^1\times {\mathrm{37}}^1\times {\mathrm{47}}^1\times {\mathrm{193}}^1$

素因数の和:295

約数の個数: 32

約数和(自身を含む): 29723904

約数和(自身を除く): 7908149

約数列:

[1, 5, 13, 37, 47, 65, 185, 193, 235, 481, 611, 965, 1739, 2405, 2509, 3055, 7141, 8695, 9071, 12545, 22607, 35705, 45355, 92833, 113035, 117923, 335627, 464165, 589615, 1678135, 4363151, 21815755]

約数ペア:

[(1, 21815755), (5, 4363151), (13, 1678135), (37, 589615), (47, 464165), (65, 335627), (185, 117923), (193, 113035), (235, 92833), (481, 45355), (611, 35705), (965, 22607), (1739, 12545), (2405, 9071), (2509, 8695), (3055, 7141)]