19915287

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^2\times {\mathrm{37}}^1\times {\mathrm{71}}^1$

素因数の和:156

約数の個数: 48

約数和(自身を含む): 33357312

約数和(自身を除く): 13442025

約数列:

[1, 3, 7, 19, 21, 37, 57, 71, 111, 133, 213, 259, 361, 399, 497, 703, 777, 1083, 1349, 1491, 2109, 2527, 2627, 4047, 4921, 7581, 7881, 9443, 13357, 14763, 18389, 25631, 28329, 40071, 49913, 55167, 76893, 93499, 149739, 179417, 280497, 349391, 538251, 948347, 1048173, 2845041, 6638429, 19915287]

約数ペア:

[(1, 19915287), (3, 6638429), (7, 2845041), (19, 1048173), (21, 948347), (37, 538251), (57, 349391), (71, 280497), (111, 179417), (133, 149739), (213, 93499), (259, 76893), (361, 55167), (399, 49913), (497, 40071), (703, 28329), (777, 25631), (1083, 18389), (1349, 14763), (1491, 13357), (2109, 9443), (2527, 7881), (2627, 7581), (4047, 4921)]