20781208

素因数分解:

$2^3\times 7^1\times {\mathrm{17}}^1\times {\mathrm{83}}^1\times {\mathrm{263}}^1$

素因数の和:376

約数の個数: 64

約数和(自身を含む): 47900160

約数和(自身を除く): 27118952

約数列:

[1, 2, 4, 7, 8, 14, 17, 28, 34, 56, 68, 83, 119, 136, 166, 238, 263, 332, 476, 526, 581, 664, 952, 1052, 1162, 1411, 1841, 2104, 2324, 2822, 3682, 4471, 4648, 5644, 7364, 8942, 9877, 11288, 14728, 17884, 19754, 21829, 31297, 35768, 39508, 43658, 62594, 79016, 87316, 125188, 152803, 174632, 250376, 305606, 371093, 611212, 742186, 1222424, 1484372, 2597651, 2968744, 5195302, 10390604, 20781208]

約数ペア:

[(1, 20781208), (2, 10390604), (4, 5195302), (7, 2968744), (8, 2597651), (14, 1484372), (17, 1222424), (28, 742186), (34, 611212), (56, 371093), (68, 305606), (83, 250376), (119, 174632), (136, 152803), (166, 125188), (238, 87316), (263, 79016), (332, 62594), (476, 43658), (526, 39508), (581, 35768), (664, 31297), (952, 21829), (1052, 19754), (1162, 17884), (1411, 14728), (1841, 11288), (2104, 9877), (2324, 8942), (2822, 7364), (3682, 5644), (4471, 4648)]