21042280

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{223}}^1\times {\mathrm{337}}^1$

素因数の和:578

約数の個数: 64

約数和(自身を含む): 54512640

約数和(自身を除く): 33470360

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 223, 280, 337, 446, 674, 892, 1115, 1348, 1561, 1685, 1784, 2230, 2359, 2696, 3122, 3370, 4460, 4718, 6244, 6740, 7805, 8920, 9436, 11795, 12488, 13480, 15610, 18872, 23590, 31220, 47180, 62440, 75151, 94360, 150302, 300604, 375755, 526057, 601208, 751510, 1052114, 1503020, 2104228, 2630285, 3006040, 4208456, 5260570, 10521140, 21042280]

約数ペア:

[(1, 21042280), (2, 10521140), (4, 5260570), (5, 4208456), (7, 3006040), (8, 2630285), (10, 2104228), (14, 1503020), (20, 1052114), (28, 751510), (35, 601208), (40, 526057), (56, 375755), (70, 300604), (140, 150302), (223, 94360), (280, 75151), (337, 62440), (446, 47180), (674, 31220), (892, 23590), (1115, 18872), (1348, 15610), (1561, 13480), (1685, 12488), (1784, 11795), (2230, 9436), (2359, 8920), (2696, 7805), (3122, 6740), (3370, 6244), (4460, 4718)]