21680904

素因数分解:

$2^3\times 3^1\times 7^1\times {\mathrm{23}}^1\times {\mathrm{31}}^1\times {\mathrm{181}}^1$

素因数の和:251

約数の個数: 128

約数和(自身を含む): 67092480

約数和(自身を除く): 45411576

約数列:

[1, 2, 3, 4, 6, 7, 8, 12, 14, 21, 23, 24, 28, 31, 42, 46, 56, 62, 69, 84, 92, 93, 124, 138, 161, 168, 181, 184, 186, 217, 248, 276, 322, 362, 372, 434, 483, 543, 552, 644, 651, 713, 724, 744, 868, 966, 1086, 1267, 1288, 1302, 1426, 1448, 1736, 1932, 2139, 2172, 2534, 2604, 2852, 3801, 3864, 4163, 4278, 4344, 4991, 5068, 5208, 5611, 5704, 7602, 8326, 8556, 9982, 10136, 11222, 12489, 14973, 15204, 16652, 16833, 17112, 19964, 22444, 24978, 29141, 29946, 30408, 33304, 33666, 39277, 39928, 44888, 49956, 58282, 59892, 67332, 78554, 87423, 99912, 116564, 117831, 119784, 129053, 134664, 157108, 174846, 233128, 235662, 258106, 314216, 349692, 387159, 471324, 516212, 699384, 774318, 903371, 942648, 1032424, 1548636, 1806742, 2710113, 3097272, 3613484, 5420226, 7226968, 10840452, 21680904]

約数ペア:

[(1, 21680904), (2, 10840452), (3, 7226968), (4, 5420226), (6, 3613484), (7, 3097272), (8, 2710113), (12, 1806742), (14, 1548636), (21, 1032424), (23, 942648), (24, 903371), (28, 774318), (31, 699384), (42, 516212), (46, 471324), (56, 387159), (62, 349692), (69, 314216), (84, 258106), (92, 235662), (93, 233128), (124, 174846), (138, 157108), (161, 134664), (168, 129053), (181, 119784), (184, 117831), (186, 116564), (217, 99912), (248, 87423), (276, 78554), (322, 67332), (362, 59892), (372, 58282), (434, 49956), (483, 44888), (543, 39928), (552, 39277), (644, 33666), (651, 33304), (713, 30408), (724, 29946), (744, 29141), (868, 24978), (966, 22444), (1086, 19964), (1267, 17112), (1288, 16833), (1302, 16652), (1426, 15204), (1448, 14973), (1736, 12489), (1932, 11222), (2139, 10136), (2172, 9982), (2534, 8556), (2604, 8326), (2852, 7602), (3801, 5704), (3864, 5611), (4163, 5208), (4278, 5068), (4344, 4991)]