21257880

素因数分解:

$2^3\times 3^1\times 5^1\times 7^1\times {\mathrm{25307}}^1$

素因数の和:25328

約数の個数: 64

約数和(自身を含む): 72887040

約数和(自身を除く): 51629160

約数列:

[1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 20, 21, 24, 28, 30, 35, 40, 42, 56, 60, 70, 84, 105, 120, 140, 168, 210, 280, 420, 840, 25307, 50614, 75921, 101228, 126535, 151842, 177149, 202456, 253070, 303684, 354298, 379605, 506140, 531447, 607368, 708596, 759210, 885745, 1012280, 1062894, 1417192, 1518420, 1771490, 2125788, 2657235, 3036840, 3542980, 4251576, 5314470, 7085960, 10628940, 21257880]

約数ペア:

[(1, 21257880), (2, 10628940), (3, 7085960), (4, 5314470), (5, 4251576), (6, 3542980), (7, 3036840), (8, 2657235), (10, 2125788), (12, 1771490), (14, 1518420), (15, 1417192), (20, 1062894), (21, 1012280), (24, 885745), (28, 759210), (30, 708596), (35, 607368), (40, 531447), (42, 506140), (56, 379605), (60, 354298), (70, 303684), (84, 253070), (105, 202456), (120, 177149), (140, 151842), (168, 126535), (210, 101228), (280, 75921), (420, 50614), (840, 25307)]