21808281

素因数分解:

$3^1\times {\mathrm{11}}^1\times {\mathrm{37}}^1\times {\mathrm{53}}^1\times {\mathrm{337}}^1$

素因数の和:441

約数の個数: 32

約数和(自身を含む): 33291648

約数和(自身を除く): 11483367

約数列:

[1, 3, 11, 33, 37, 53, 111, 159, 337, 407, 583, 1011, 1221, 1749, 1961, 3707, 5883, 11121, 12469, 17861, 21571, 37407, 53583, 64713, 137159, 196471, 411477, 589413, 660857, 1982571, 7269427, 21808281]

約数ペア:

[(1, 21808281), (3, 7269427), (11, 1982571), (33, 660857), (37, 589413), (53, 411477), (111, 196471), (159, 137159), (337, 64713), (407, 53583), (583, 37407), (1011, 21571), (1221, 17861), (1749, 12469), (1961, 11121), (3707, 5883)]