20991256

素因数分解:

$2^3\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{59}}^1\times {\mathrm{311}}^1$

素因数の和:400

約数の個数: 64

約数和(自身を含む): 47174400

約数和(自身を除く): 26183144

約数列:

[1, 2, 4, 8, 11, 13, 22, 26, 44, 52, 59, 88, 104, 118, 143, 236, 286, 311, 472, 572, 622, 649, 767, 1144, 1244, 1298, 1534, 2488, 2596, 3068, 3421, 4043, 5192, 6136, 6842, 8086, 8437, 13684, 16172, 16874, 18349, 27368, 32344, 33748, 36698, 44473, 67496, 73396, 88946, 146792, 177892, 201839, 238537, 355784, 403678, 477074, 807356, 954148, 1614712, 1908296, 2623907, 5247814, 10495628, 20991256]

約数ペア:

[(1, 20991256), (2, 10495628), (4, 5247814), (8, 2623907), (11, 1908296), (13, 1614712), (22, 954148), (26, 807356), (44, 477074), (52, 403678), (59, 355784), (88, 238537), (104, 201839), (118, 177892), (143, 146792), (236, 88946), (286, 73396), (311, 67496), (472, 44473), (572, 36698), (622, 33748), (649, 32344), (767, 27368), (1144, 18349), (1244, 16874), (1298, 16172), (1534, 13684), (2488, 8437), (2596, 8086), (3068, 6842), (3421, 6136), (4043, 5192)]