21004984

素因数分解:

$2^3\times 7^1\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{61}}^1$

素因数の和:141

約数の個数: 128

約数和(自身を含む): 54996480

約数和(自身を除く): 33991496

約数列:

[1, 2, 4, 7, 8, 11, 13, 14, 22, 26, 28, 43, 44, 52, 56, 61, 77, 86, 88, 91, 104, 122, 143, 154, 172, 182, 244, 286, 301, 308, 344, 364, 427, 473, 488, 559, 572, 602, 616, 671, 728, 793, 854, 946, 1001, 1118, 1144, 1204, 1342, 1586, 1708, 1892, 2002, 2236, 2408, 2623, 2684, 3172, 3311, 3416, 3784, 3913, 4004, 4472, 4697, 5246, 5368, 5551, 6149, 6344, 6622, 7826, 8008, 8723, 9394, 10492, 11102, 12298, 13244, 15652, 17446, 18361, 18788, 20984, 22204, 24596, 26488, 28853, 31304, 34099, 34892, 36722, 37576, 43043, 44408, 49192, 57706, 61061, 68198, 69784, 73444, 86086, 115412, 122122, 136396, 146888, 172172, 201971, 230824, 238693, 244244, 272792, 344344, 375089, 403942, 477386, 488488, 750178, 807884, 954772, 1500356, 1615768, 1909544, 2625623, 3000712, 5251246, 10502492, 21004984]

約数ペア:

[(1, 21004984), (2, 10502492), (4, 5251246), (7, 3000712), (8, 2625623), (11, 1909544), (13, 1615768), (14, 1500356), (22, 954772), (26, 807884), (28, 750178), (43, 488488), (44, 477386), (52, 403942), (56, 375089), (61, 344344), (77, 272792), (86, 244244), (88, 238693), (91, 230824), (104, 201971), (122, 172172), (143, 146888), (154, 136396), (172, 122122), (182, 115412), (244, 86086), (286, 73444), (301, 69784), (308, 68198), (344, 61061), (364, 57706), (427, 49192), (473, 44408), (488, 43043), (559, 37576), (572, 36722), (602, 34892), (616, 34099), (671, 31304), (728, 28853), (793, 26488), (854, 24596), (946, 22204), (1001, 20984), (1118, 18788), (1144, 18361), (1204, 17446), (1342, 15652), (1586, 13244), (1708, 12298), (1892, 11102), (2002, 10492), (2236, 9394), (2408, 8723), (2623, 8008), (2684, 7826), (3172, 6622), (3311, 6344), (3416, 6149), (3784, 5551), (3913, 5368), (4004, 5246), (4472, 4697)]