20987109

素因数分解:

$3^2\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{709}}^1$

素因数の和:762

約数の個数: 48

約数和(自身を含む): 37215360

約数和(自身を除く): 16228251

約数列:

[1, 3, 9, 11, 13, 23, 33, 39, 69, 99, 117, 143, 207, 253, 299, 429, 709, 759, 897, 1287, 2127, 2277, 2691, 3289, 6381, 7799, 9217, 9867, 16307, 23397, 27651, 29601, 48921, 70191, 82953, 101387, 146763, 179377, 211991, 304161, 538131, 635973, 912483, 1614393, 1907919, 2331901, 6995703, 20987109]

約数ペア:

[(1, 20987109), (3, 6995703), (9, 2331901), (11, 1907919), (13, 1614393), (23, 912483), (33, 635973), (39, 538131), (69, 304161), (99, 211991), (117, 179377), (143, 146763), (207, 101387), (253, 82953), (299, 70191), (429, 48921), (709, 29601), (759, 27651), (897, 23397), (1287, 16307), (2127, 9867), (2277, 9217), (2691, 7799), (3289, 6381)]