21053440

素因数分解:

$2^{14}\times 5^1\times {\mathrm{257}}^1$

素因数の和:290

約数の個数: 60

約数和(自身を含む): 50723316

約数和(自身を除く): 29669876

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 256, 257, 320, 512, 514, 640, 1024, 1028, 1280, 1285, 2048, 2056, 2560, 2570, 4096, 4112, 5120, 5140, 8192, 8224, 10240, 10280, 16384, 16448, 20480, 20560, 32896, 40960, 41120, 65792, 81920, 82240, 131584, 164480, 263168, 328960, 526336, 657920, 1052672, 1315840, 2105344, 2631680, 4210688, 5263360, 10526720, 21053440]

約数ペア:

[(1, 21053440), (2, 10526720), (4, 5263360), (5, 4210688), (8, 2631680), (10, 2105344), (16, 1315840), (20, 1052672), (32, 657920), (40, 526336), (64, 328960), (80, 263168), (128, 164480), (160, 131584), (256, 82240), (257, 81920), (320, 65792), (512, 41120), (514, 40960), (640, 32896), (1024, 20560), (1028, 20480), (1280, 16448), (1285, 16384), (2048, 10280), (2056, 10240), (2560, 8224), (2570, 8192), (4096, 5140), (4112, 5120)]