81157040

素因数分解:

$2^4\times 5^1\times {\mathrm{41}}^1\times {\mathrm{109}}^1\times {\mathrm{227}}^1$

素因数の和:390

約数の個数: 80

約数和(自身を含む): 195924960

約数和(自身を除く): 114767920

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 41, 80, 82, 109, 164, 205, 218, 227, 328, 410, 436, 454, 545, 656, 820, 872, 908, 1090, 1135, 1640, 1744, 1816, 2180, 2270, 3280, 3632, 4360, 4469, 4540, 8720, 8938, 9080, 9307, 17876, 18160, 18614, 22345, 24743, 35752, 37228, 44690, 46535, 49486, 71504, 74456, 89380, 93070, 98972, 123715, 148912, 178760, 186140, 197944, 247430, 357520, 372280, 395888, 494860, 744560, 989720, 1014463, 1979440, 2028926, 4057852, 5072315, 8115704, 10144630, 16231408, 20289260, 40578520, 81157040]

約数ペア:

[(1, 81157040), (2, 40578520), (4, 20289260), (5, 16231408), (8, 10144630), (10, 8115704), (16, 5072315), (20, 4057852), (40, 2028926), (41, 1979440), (80, 1014463), (82, 989720), (109, 744560), (164, 494860), (205, 395888), (218, 372280), (227, 357520), (328, 247430), (410, 197944), (436, 186140), (454, 178760), (545, 148912), (656, 123715), (820, 98972), (872, 93070), (908, 89380), (1090, 74456), (1135, 71504), (1640, 49486), (1744, 46535), (1816, 44690), (2180, 37228), (2270, 35752), (3280, 24743), (3632, 22345), (4360, 18614), (4469, 18160), (4540, 17876), (8720, 9307), (8938, 9080)]