21277564

素因数分解:

$2^2\times 7^2\times {\mathrm{11}}^1\times {\mathrm{71}}^1\times {\mathrm{139}}^1$

素因数の和:239

約数の個数: 72

約数和(自身を含む): 48263040

約数和(自身を除く): 26985476

約数列:

[1, 2, 4, 7, 11, 14, 22, 28, 44, 49, 71, 77, 98, 139, 142, 154, 196, 278, 284, 308, 497, 539, 556, 781, 973, 994, 1078, 1529, 1562, 1946, 1988, 2156, 3058, 3124, 3479, 3892, 5467, 6116, 6811, 6958, 9869, 10703, 10934, 13622, 13916, 19738, 21406, 21868, 27244, 38269, 39476, 42812, 69083, 74921, 76538, 108559, 138166, 149842, 153076, 217118, 276332, 299684, 434236, 483581, 759913, 967162, 1519826, 1934324, 3039652, 5319391, 10638782, 21277564]

約数ペア:

[(1, 21277564), (2, 10638782), (4, 5319391), (7, 3039652), (11, 1934324), (14, 1519826), (22, 967162), (28, 759913), (44, 483581), (49, 434236), (71, 299684), (77, 276332), (98, 217118), (139, 153076), (142, 149842), (154, 138166), (196, 108559), (278, 76538), (284, 74921), (308, 69083), (497, 42812), (539, 39476), (556, 38269), (781, 27244), (973, 21868), (994, 21406), (1078, 19738), (1529, 13916), (1562, 13622), (1946, 10934), (1988, 10703), (2156, 9869), (3058, 6958), (3124, 6811), (3479, 6116), (3892, 5467)]