21165040

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{433}}^1$

素因数の和:506

約数の個数: 80

約数和(自身を含む): 54246528

約数和(自身を除く): 33081488

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 47, 52, 65, 80, 94, 104, 130, 188, 208, 235, 260, 376, 433, 470, 520, 611, 752, 866, 940, 1040, 1222, 1732, 1880, 2165, 2444, 3055, 3464, 3760, 4330, 4888, 5629, 6110, 6928, 8660, 9776, 11258, 12220, 17320, 20351, 22516, 24440, 28145, 34640, 40702, 45032, 48880, 56290, 81404, 90064, 101755, 112580, 162808, 203510, 225160, 264563, 325616, 407020, 450320, 529126, 814040, 1058252, 1322815, 1628080, 2116504, 2645630, 4233008, 5291260, 10582520, 21165040]

約数ペア:

[(1, 21165040), (2, 10582520), (4, 5291260), (5, 4233008), (8, 2645630), (10, 2116504), (13, 1628080), (16, 1322815), (20, 1058252), (26, 814040), (40, 529126), (47, 450320), (52, 407020), (65, 325616), (80, 264563), (94, 225160), (104, 203510), (130, 162808), (188, 112580), (208, 101755), (235, 90064), (260, 81404), (376, 56290), (433, 48880), (470, 45032), (520, 40702), (611, 34640), (752, 28145), (866, 24440), (940, 22516), (1040, 20351), (1222, 17320), (1732, 12220), (1880, 11258), (2165, 9776), (2444, 8660), (3055, 6928), (3464, 6110), (3760, 5629), (4330, 4888)]