19997945

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{31}}^1\times {\mathrm{37}}^1\times {\mathrm{317}}^1$

素因数の和:401

約数の個数: 32

約数和(自身を含む): 27841536

約数和(自身を除く): 7843591

約数列:

[1, 5, 11, 31, 37, 55, 155, 185, 317, 341, 407, 1147, 1585, 1705, 2035, 3487, 5735, 9827, 11729, 12617, 17435, 49135, 58645, 63085, 108097, 129019, 363599, 540485, 645095, 1817995, 3999589, 19997945]

約数ペア:

[(1, 19997945), (5, 3999589), (11, 1817995), (31, 645095), (37, 540485), (55, 363599), (155, 129019), (185, 108097), (317, 63085), (341, 58645), (407, 49135), (1147, 17435), (1585, 12617), (1705, 11729), (2035, 9827), (3487, 5735)]