21109869

素因数分解:

$3^3\times {\mathrm{11}}^1\times {\mathrm{17}}^1\times {\mathrm{37}}^1\times {\mathrm{113}}^1$

素因数の和:187

約数の個数: 64

約数和(自身を含む): 37428480

約数和(自身を除く): 16318611

約数列:

[1, 3, 9, 11, 17, 27, 33, 37, 51, 99, 111, 113, 153, 187, 297, 333, 339, 407, 459, 561, 629, 999, 1017, 1221, 1243, 1683, 1887, 1921, 3051, 3663, 3729, 4181, 5049, 5661, 5763, 6919, 10989, 11187, 12543, 16983, 17289, 20757, 21131, 33561, 37629, 45991, 51867, 62271, 63393, 71077, 112887, 137973, 186813, 190179, 213231, 413919, 570537, 639693, 781847, 1241757, 1919079, 2345541, 7036623, 21109869]

約数ペア:

[(1, 21109869), (3, 7036623), (9, 2345541), (11, 1919079), (17, 1241757), (27, 781847), (33, 639693), (37, 570537), (51, 413919), (99, 213231), (111, 190179), (113, 186813), (153, 137973), (187, 112887), (297, 71077), (333, 63393), (339, 62271), (407, 51867), (459, 45991), (561, 37629), (629, 33561), (999, 21131), (1017, 20757), (1221, 17289), (1243, 16983), (1683, 12543), (1887, 11187), (1921, 10989), (3051, 6919), (3663, 5763), (3729, 5661), (4181, 5049)]