21052240

素因数分解:

$2^4\times 5^1\times {\mathrm{11}}^1\times {\mathrm{47}}^1\times {\mathrm{509}}^1$

素因数の和:580

約数の個数: 80

約数和(自身を含む): 54639360

約数和(自身を除く): 33587120

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 40, 44, 47, 55, 80, 88, 94, 110, 176, 188, 220, 235, 376, 440, 470, 509, 517, 752, 880, 940, 1018, 1034, 1880, 2036, 2068, 2545, 2585, 3760, 4072, 4136, 5090, 5170, 5599, 8144, 8272, 10180, 10340, 11198, 20360, 20680, 22396, 23923, 27995, 40720, 41360, 44792, 47846, 55990, 89584, 95692, 111980, 119615, 191384, 223960, 239230, 263153, 382768, 447920, 478460, 526306, 956920, 1052612, 1315765, 1913840, 2105224, 2631530, 4210448, 5263060, 10526120, 21052240]

約数ペア:

[(1, 21052240), (2, 10526120), (4, 5263060), (5, 4210448), (8, 2631530), (10, 2105224), (11, 1913840), (16, 1315765), (20, 1052612), (22, 956920), (40, 526306), (44, 478460), (47, 447920), (55, 382768), (80, 263153), (88, 239230), (94, 223960), (110, 191384), (176, 119615), (188, 111980), (220, 95692), (235, 89584), (376, 55990), (440, 47846), (470, 44792), (509, 41360), (517, 40720), (752, 27995), (880, 23923), (940, 22396), (1018, 20680), (1034, 20360), (1880, 11198), (2036, 10340), (2068, 10180), (2545, 8272), (2585, 8144), (3760, 5599), (4072, 5170), (4136, 5090)]