18911403

素因数分解:

$3^2\times 7^2\times {\mathrm{19}}^1\times {\mathrm{37}}^1\times {\mathrm{61}}^1$

素因数の和:137

約数の個数: 72

約数和(自身を含む): 34915920

約数和(自身を除く): 16004517

約数列:

[1, 3, 7, 9, 19, 21, 37, 49, 57, 61, 63, 111, 133, 147, 171, 183, 259, 333, 399, 427, 441, 549, 703, 777, 931, 1159, 1197, 1281, 1813, 2109, 2257, 2331, 2793, 2989, 3477, 3843, 4921, 5439, 6327, 6771, 8113, 8379, 8967, 10431, 14763, 15799, 16317, 20313, 24339, 26901, 34447, 42883, 44289, 47397, 56791, 73017, 103341, 110593, 128649, 142191, 170373, 300181, 310023, 331779, 385947, 511119, 900543, 995337, 2101267, 2701629, 6303801, 18911403]

約数ペア:

[(1, 18911403), (3, 6303801), (7, 2701629), (9, 2101267), (19, 995337), (21, 900543), (37, 511119), (49, 385947), (57, 331779), (61, 310023), (63, 300181), (111, 170373), (133, 142191), (147, 128649), (171, 110593), (183, 103341), (259, 73017), (333, 56791), (399, 47397), (427, 44289), (441, 42883), (549, 34447), (703, 26901), (777, 24339), (931, 20313), (1159, 16317), (1197, 15799), (1281, 14763), (1813, 10431), (2109, 8967), (2257, 8379), (2331, 8113), (2793, 6771), (2989, 6327), (3477, 5439), (3843, 4921)]