21123256

素因数分解:

$2^3\times 7^1\times {\mathrm{11}}^1\times {\mathrm{53}}^1\times {\mathrm{647}}^1$

素因数の和:724

約数の個数: 64

約数和(自身を含む): 50388480

約数和(自身を除く): 29265224

約数列:

[1, 2, 4, 7, 8, 11, 14, 22, 28, 44, 53, 56, 77, 88, 106, 154, 212, 308, 371, 424, 583, 616, 647, 742, 1166, 1294, 1484, 2332, 2588, 2968, 4081, 4529, 4664, 5176, 7117, 8162, 9058, 14234, 16324, 18116, 28468, 32648, 34291, 36232, 49819, 56936, 68582, 99638, 137164, 199276, 240037, 274328, 377201, 398552, 480074, 754402, 960148, 1508804, 1920296, 2640407, 3017608, 5280814, 10561628, 21123256]

約数ペア:

[(1, 21123256), (2, 10561628), (4, 5280814), (7, 3017608), (8, 2640407), (11, 1920296), (14, 1508804), (22, 960148), (28, 754402), (44, 480074), (53, 398552), (56, 377201), (77, 274328), (88, 240037), (106, 199276), (154, 137164), (212, 99638), (308, 68582), (371, 56936), (424, 49819), (583, 36232), (616, 34291), (647, 32648), (742, 28468), (1166, 18116), (1294, 16324), (1484, 14234), (2332, 9058), (2588, 8162), (2968, 7117), (4081, 5176), (4529, 4664)]