21485984

素因数分解:

$2^5\times {\mathrm{13}}^2\times {\mathrm{29}}^1\times {\mathrm{137}}^1$

素因数の和:202

約数の個数: 72

約数和(自身を含む): 47730060

約数和(自身を除く): 26244076

約数列:

[1, 2, 4, 8, 13, 16, 26, 29, 32, 52, 58, 104, 116, 137, 169, 208, 232, 274, 338, 377, 416, 464, 548, 676, 754, 928, 1096, 1352, 1508, 1781, 2192, 2704, 3016, 3562, 3973, 4384, 4901, 5408, 6032, 7124, 7946, 9802, 12064, 14248, 15892, 19604, 23153, 28496, 31784, 39208, 46306, 51649, 56992, 63568, 78416, 92612, 103298, 127136, 156832, 185224, 206596, 370448, 413192, 671437, 740896, 826384, 1342874, 1652768, 2685748, 5371496, 10742992, 21485984]

約数ペア:

[(1, 21485984), (2, 10742992), (4, 5371496), (8, 2685748), (13, 1652768), (16, 1342874), (26, 826384), (29, 740896), (32, 671437), (52, 413192), (58, 370448), (104, 206596), (116, 185224), (137, 156832), (169, 127136), (208, 103298), (232, 92612), (274, 78416), (338, 63568), (377, 56992), (416, 51649), (464, 46306), (548, 39208), (676, 31784), (754, 28496), (928, 23153), (1096, 19604), (1352, 15892), (1508, 14248), (1781, 12064), (2192, 9802), (2704, 7946), (3016, 7124), (3562, 6032), (3973, 5408), (4384, 4901)]