21387861

素因数分解:

$3^3\times {\mathrm{11}}^1\times {\mathrm{23}}^1\times {\mathrm{31}}^1\times {\mathrm{101}}^1$

素因数の和:175

約数の個数: 64

約数和(自身を含む): 37601280

約数和(自身を除く): 16213419

約数列:

[1, 3, 9, 11, 23, 27, 31, 33, 69, 93, 99, 101, 207, 253, 279, 297, 303, 341, 621, 713, 759, 837, 909, 1023, 1111, 2139, 2277, 2323, 2727, 3069, 3131, 3333, 6417, 6831, 6969, 7843, 9207, 9393, 9999, 19251, 20907, 23529, 25553, 28179, 29997, 34441, 62721, 70587, 72013, 76659, 84537, 103323, 211761, 216039, 229977, 309969, 648117, 689931, 792143, 929907, 1944351, 2376429, 7129287, 21387861]

約数ペア:

[(1, 21387861), (3, 7129287), (9, 2376429), (11, 1944351), (23, 929907), (27, 792143), (31, 689931), (33, 648117), (69, 309969), (93, 229977), (99, 216039), (101, 211761), (207, 103323), (253, 84537), (279, 76659), (297, 72013), (303, 70587), (341, 62721), (621, 34441), (713, 29997), (759, 28179), (837, 25553), (909, 23529), (1023, 20907), (1111, 19251), (2139, 9999), (2277, 9393), (2323, 9207), (2727, 7843), (3069, 6969), (3131, 6831), (3333, 6417)]