19718181

素因数分解:

$3^3\times 7^1\times {\mathrm{17}}^2\times {\mathrm{19}}^2$

素因数の和:88

約数の個数: 72

約数和(自身を含む): 37429440

約数和(自身を除く): 17711259

約数列:

[1, 3, 7, 9, 17, 19, 21, 27, 51, 57, 63, 119, 133, 153, 171, 189, 289, 323, 357, 361, 399, 459, 513, 867, 969, 1071, 1083, 1197, 2023, 2261, 2527, 2601, 2907, 3213, 3249, 3591, 5491, 6069, 6137, 6783, 7581, 7803, 8721, 9747, 16473, 18207, 18411, 20349, 22743, 38437, 42959, 49419, 54621, 55233, 61047, 68229, 104329, 115311, 128877, 148257, 165699, 312987, 345933, 386631, 730303, 938961, 1037799, 1159893, 2190909, 2816883, 6572727, 19718181]

約数ペア:

[(1, 19718181), (3, 6572727), (7, 2816883), (9, 2190909), (17, 1159893), (19, 1037799), (21, 938961), (27, 730303), (51, 386631), (57, 345933), (63, 312987), (119, 165699), (133, 148257), (153, 128877), (171, 115311), (189, 104329), (289, 68229), (323, 61047), (357, 55233), (361, 54621), (399, 49419), (459, 42959), (513, 38437), (867, 22743), (969, 20349), (1071, 18411), (1083, 18207), (1197, 16473), (2023, 9747), (2261, 8721), (2527, 7803), (2601, 7581), (2907, 6783), (3213, 6137), (3249, 6069), (3591, 5491)]