21505280

素因数分解:

$2^8\times 5^1\times {\mathrm{53}}^1\times {\mathrm{317}}^1$

素因数の和:391

約数の個数: 72

約数和(自身を含む): 52649352

約数和(自身を除く): 31144072

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 53, 64, 80, 106, 128, 160, 212, 256, 265, 317, 320, 424, 530, 634, 640, 848, 1060, 1268, 1280, 1585, 1696, 2120, 2536, 3170, 3392, 4240, 5072, 6340, 6784, 8480, 10144, 12680, 13568, 16801, 16960, 20288, 25360, 33602, 33920, 40576, 50720, 67204, 67840, 81152, 84005, 101440, 134408, 168010, 202880, 268816, 336020, 405760, 537632, 672040, 1075264, 1344080, 2150528, 2688160, 4301056, 5376320, 10752640, 21505280]

約数ペア:

[(1, 21505280), (2, 10752640), (4, 5376320), (5, 4301056), (8, 2688160), (10, 2150528), (16, 1344080), (20, 1075264), (32, 672040), (40, 537632), (53, 405760), (64, 336020), (80, 268816), (106, 202880), (128, 168010), (160, 134408), (212, 101440), (256, 84005), (265, 81152), (317, 67840), (320, 67204), (424, 50720), (530, 40576), (634, 33920), (640, 33602), (848, 25360), (1060, 20288), (1268, 16960), (1280, 16801), (1585, 13568), (1696, 12680), (2120, 10144), (2536, 8480), (3170, 6784), (3392, 6340), (4240, 5072)]