21280688

素因数分解:

$2^4\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{71}}^1\times {\mathrm{131}}^1$

素因数の和:234

約数の個数: 80

約数和(自身を含む): 49496832

約数和(自身を除く): 28216144

約数列:

[1, 2, 4, 8, 11, 13, 16, 22, 26, 44, 52, 71, 88, 104, 131, 142, 143, 176, 208, 262, 284, 286, 524, 568, 572, 781, 923, 1048, 1136, 1144, 1441, 1562, 1703, 1846, 2096, 2288, 2882, 3124, 3406, 3692, 5764, 6248, 6812, 7384, 9301, 10153, 11528, 12496, 13624, 14768, 18602, 18733, 20306, 23056, 27248, 37204, 37466, 40612, 74408, 74932, 81224, 102311, 120913, 148816, 149864, 162448, 204622, 241826, 299728, 409244, 483652, 818488, 967304, 1330043, 1636976, 1934608, 2660086, 5320172, 10640344, 21280688]

約数ペア:

[(1, 21280688), (2, 10640344), (4, 5320172), (8, 2660086), (11, 1934608), (13, 1636976), (16, 1330043), (22, 967304), (26, 818488), (44, 483652), (52, 409244), (71, 299728), (88, 241826), (104, 204622), (131, 162448), (142, 149864), (143, 148816), (176, 120913), (208, 102311), (262, 81224), (284, 74932), (286, 74408), (524, 40612), (568, 37466), (572, 37204), (781, 27248), (923, 23056), (1048, 20306), (1136, 18733), (1144, 18602), (1441, 14768), (1562, 13624), (1703, 12496), (1846, 11528), (2096, 10153), (2288, 9301), (2882, 7384), (3124, 6812), (3406, 6248), (3692, 5764)]