21171920

素因数分解:

$2^4\times 5^1\times 7^2\times {\mathrm{11}}^1\times {\mathrm{491}}^1$

素因数の和:529

約数の個数: 120

約数和(自身を含む): 62594208

約数和(自身を除く): 41422288

約数列:

[1, 2, 4, 5, 7, 8, 10, 11, 14, 16, 20, 22, 28, 35, 40, 44, 49, 55, 56, 70, 77, 80, 88, 98, 110, 112, 140, 154, 176, 196, 220, 245, 280, 308, 385, 392, 440, 490, 491, 539, 560, 616, 770, 784, 880, 980, 982, 1078, 1232, 1540, 1960, 1964, 2156, 2455, 2695, 3080, 3437, 3920, 3928, 4312, 4910, 5390, 5401, 6160, 6874, 7856, 8624, 9820, 10780, 10802, 13748, 17185, 19640, 21560, 21604, 24059, 27005, 27496, 34370, 37807, 39280, 43120, 43208, 48118, 54010, 54992, 68740, 75614, 86416, 96236, 108020, 120295, 137480, 151228, 189035, 192472, 216040, 240590, 264649, 274960, 302456, 378070, 384944, 432080, 481180, 529298, 604912, 756140, 962360, 1058596, 1323245, 1512280, 1924720, 2117192, 2646490, 3024560, 4234384, 5292980, 10585960, 21171920]

約数ペア:

[(1, 21171920), (2, 10585960), (4, 5292980), (5, 4234384), (7, 3024560), (8, 2646490), (10, 2117192), (11, 1924720), (14, 1512280), (16, 1323245), (20, 1058596), (22, 962360), (28, 756140), (35, 604912), (40, 529298), (44, 481180), (49, 432080), (55, 384944), (56, 378070), (70, 302456), (77, 274960), (80, 264649), (88, 240590), (98, 216040), (110, 192472), (112, 189035), (140, 151228), (154, 137480), (176, 120295), (196, 108020), (220, 96236), (245, 86416), (280, 75614), (308, 68740), (385, 54992), (392, 54010), (440, 48118), (490, 43208), (491, 43120), (539, 39280), (560, 37807), (616, 34370), (770, 27496), (784, 27005), (880, 24059), (980, 21604), (982, 21560), (1078, 19640), (1232, 17185), (1540, 13748), (1960, 10802), (1964, 10780), (2156, 9820), (2455, 8624), (2695, 7856), (3080, 6874), (3437, 6160), (3920, 5401), (3928, 5390), (4312, 4910)]