209919519

素因数分解:

$3^4\times {\mathrm{17}}^1\times {\mathrm{157}}^1\times {\mathrm{971}}^1$

素因数の和:1157

約数の個数: 40

約数和(自身を含む): 334488528

約数和(自身を除く): 124569009

約数列:

[1, 3, 9, 17, 27, 51, 81, 153, 157, 459, 471, 971, 1377, 1413, 2669, 2913, 4239, 8007, 8739, 12717, 16507, 24021, 26217, 49521, 72063, 78651, 148563, 152447, 216189, 445689, 457341, 1337067, 1372023, 2591599, 4116069, 7774797, 12348207, 23324391, 69973173, 209919519]

約数ペア:

[(1, 209919519), (3, 69973173), (9, 23324391), (17, 12348207), (27, 7774797), (51, 4116069), (81, 2591599), (153, 1372023), (157, 1337067), (459, 457341), (471, 445689), (971, 216189), (1377, 152447), (1413, 148563), (2669, 78651), (2913, 72063), (4239, 49521), (8007, 26217), (8739, 24021), (12717, 16507)]