19911879

素因数分解:

$3^3\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{47}}^1\times {\mathrm{71}}^1$

素因数の和:157

約数の個数: 64

約数和(自身を含む): 34836480

約数和(自身を除く): 14924601

約数列:

[1, 3, 9, 13, 17, 27, 39, 47, 51, 71, 117, 141, 153, 213, 221, 351, 423, 459, 611, 639, 663, 799, 923, 1207, 1269, 1833, 1917, 1989, 2397, 2769, 3337, 3621, 5499, 5967, 7191, 8307, 10011, 10387, 10863, 15691, 16497, 21573, 24921, 30033, 31161, 32589, 43381, 47073, 56729, 90099, 93483, 130143, 141219, 170187, 280449, 390429, 423657, 510561, 737477, 1171287, 1531683, 2212431, 6637293, 19911879]

約数ペア:

[(1, 19911879), (3, 6637293), (9, 2212431), (13, 1531683), (17, 1171287), (27, 737477), (39, 510561), (47, 423657), (51, 390429), (71, 280449), (117, 170187), (141, 141219), (153, 130143), (213, 93483), (221, 90099), (351, 56729), (423, 47073), (459, 43381), (611, 32589), (639, 31161), (663, 30033), (799, 24921), (923, 21573), (1207, 16497), (1269, 15691), (1833, 10863), (1917, 10387), (1989, 10011), (2397, 8307), (2769, 7191), (3337, 5967), (3621, 5499)]