21505806

素因数分解:

$2^1\times 3^2\times 7^2\times {\mathrm{37}}^1\times {\mathrm{659}}^1$

素因数の和:718

約数の個数: 72

約数和(自身を含む): 55752840

約数和(自身を除く): 34247034

約数列:

[1, 2, 3, 6, 7, 9, 14, 18, 21, 37, 42, 49, 63, 74, 98, 111, 126, 147, 222, 259, 294, 333, 441, 518, 659, 666, 777, 882, 1318, 1554, 1813, 1977, 2331, 3626, 3954, 4613, 4662, 5439, 5931, 9226, 10878, 11862, 13839, 16317, 24383, 27678, 32291, 32634, 41517, 48766, 64582, 73149, 83034, 96873, 146298, 170681, 193746, 219447, 290619, 341362, 438894, 512043, 581238, 1024086, 1194767, 1536129, 2389534, 3072258, 3584301, 7168602, 10752903, 21505806]

約数ペア:

[(1, 21505806), (2, 10752903), (3, 7168602), (6, 3584301), (7, 3072258), (9, 2389534), (14, 1536129), (18, 1194767), (21, 1024086), (37, 581238), (42, 512043), (49, 438894), (63, 341362), (74, 290619), (98, 219447), (111, 193746), (126, 170681), (147, 146298), (222, 96873), (259, 83034), (294, 73149), (333, 64582), (441, 48766), (518, 41517), (659, 32634), (666, 32291), (777, 27678), (882, 24383), (1318, 16317), (1554, 13839), (1813, 11862), (1977, 10878), (2331, 9226), (3626, 5931), (3954, 5439), (4613, 4662)]