21399664

素因数分解:

$2^4\times {\mathrm{11}}^1\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{199}}^1$

素因数の和:278

約数の個数: 80

約数和(自身を含む): 49996800

約数和(自身を除く): 28597136

約数列:

[1, 2, 4, 8, 11, 13, 16, 22, 26, 44, 47, 52, 88, 94, 104, 143, 176, 188, 199, 208, 286, 376, 398, 517, 572, 611, 752, 796, 1034, 1144, 1222, 1592, 2068, 2189, 2288, 2444, 2587, 3184, 4136, 4378, 4888, 5174, 6721, 8272, 8756, 9353, 9776, 10348, 13442, 17512, 18706, 20696, 26884, 28457, 35024, 37412, 41392, 53768, 56914, 74824, 102883, 107536, 113828, 121589, 149648, 205766, 227656, 243178, 411532, 455312, 486356, 823064, 972712, 1337479, 1646128, 1945424, 2674958, 5349916, 10699832, 21399664]

約数ペア:

[(1, 21399664), (2, 10699832), (4, 5349916), (8, 2674958), (11, 1945424), (13, 1646128), (16, 1337479), (22, 972712), (26, 823064), (44, 486356), (47, 455312), (52, 411532), (88, 243178), (94, 227656), (104, 205766), (143, 149648), (176, 121589), (188, 113828), (199, 107536), (208, 102883), (286, 74824), (376, 56914), (398, 53768), (517, 41392), (572, 37412), (611, 35024), (752, 28457), (796, 26884), (1034, 20696), (1144, 18706), (1222, 17512), (1592, 13442), (2068, 10348), (2189, 9776), (2288, 9353), (2444, 8756), (2587, 8272), (3184, 6721), (4136, 5174), (4378, 4888)]