21291760

素因数分解:

$2^4\times 5^1\times 7^1\times {\mathrm{193}}^1\times {\mathrm{197}}^1$

素因数の和:410

約数の個数: 80

約数和(自身を含む): 57157056

約数和(自身を除く): 35865296

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 28, 35, 40, 56, 70, 80, 112, 140, 193, 197, 280, 386, 394, 560, 772, 788, 965, 985, 1351, 1379, 1544, 1576, 1930, 1970, 2702, 2758, 3088, 3152, 3860, 3940, 5404, 5516, 6755, 6895, 7720, 7880, 10808, 11032, 13510, 13790, 15440, 15760, 21616, 22064, 27020, 27580, 38021, 54040, 55160, 76042, 108080, 110320, 152084, 190105, 266147, 304168, 380210, 532294, 608336, 760420, 1064588, 1330735, 1520840, 2129176, 2661470, 3041680, 4258352, 5322940, 10645880, 21291760]

約数ペア:

[(1, 21291760), (2, 10645880), (4, 5322940), (5, 4258352), (7, 3041680), (8, 2661470), (10, 2129176), (14, 1520840), (16, 1330735), (20, 1064588), (28, 760420), (35, 608336), (40, 532294), (56, 380210), (70, 304168), (80, 266147), (112, 190105), (140, 152084), (193, 110320), (197, 108080), (280, 76042), (386, 55160), (394, 54040), (560, 38021), (772, 27580), (788, 27020), (965, 22064), (985, 21616), (1351, 15760), (1379, 15440), (1544, 13790), (1576, 13510), (1930, 11032), (1970, 10808), (2702, 7880), (2758, 7720), (3088, 6895), (3152, 6755), (3860, 5516), (3940, 5404)]