20718784

素因数分解:

$2^6\times {\mathrm{17}}^1\times {\mathrm{137}}^1\times {\mathrm{139}}^1$

素因数の和:305

約数の個数: 56

約数和(自身を含む): 44165520

約数和(自身を除く): 23446736

約数列:

[1, 2, 4, 8, 16, 17, 32, 34, 64, 68, 136, 137, 139, 272, 274, 278, 544, 548, 556, 1088, 1096, 1112, 2192, 2224, 2329, 2363, 4384, 4448, 4658, 4726, 8768, 8896, 9316, 9452, 18632, 18904, 19043, 37264, 37808, 38086, 74528, 75616, 76172, 149056, 151232, 152344, 304688, 323731, 609376, 647462, 1218752, 1294924, 2589848, 5179696, 10359392, 20718784]

約数ペア:

[(1, 20718784), (2, 10359392), (4, 5179696), (8, 2589848), (16, 1294924), (17, 1218752), (32, 647462), (34, 609376), (64, 323731), (68, 304688), (136, 152344), (137, 151232), (139, 149056), (272, 76172), (274, 75616), (278, 74528), (544, 38086), (548, 37808), (556, 37264), (1088, 19043), (1096, 18904), (1112, 18632), (2192, 9452), (2224, 9316), (2329, 8896), (2363, 8768), (4384, 4726), (4448, 4658)]