20840872

素因数分解:

$2^3\times {\mathrm{13}}^1\times {\mathrm{19}}^1\times {\mathrm{53}}^1\times {\mathrm{199}}^1$

素因数の和:290

約数の個数: 64

約数和(自身を含む): 45360000

約数和(自身を除く): 24519128

約数列:

[1, 2, 4, 8, 13, 19, 26, 38, 52, 53, 76, 104, 106, 152, 199, 212, 247, 398, 424, 494, 689, 796, 988, 1007, 1378, 1592, 1976, 2014, 2587, 2756, 3781, 4028, 5174, 5512, 7562, 8056, 10348, 10547, 13091, 15124, 20696, 21094, 26182, 30248, 42188, 49153, 52364, 84376, 98306, 104728, 137111, 196612, 200393, 274222, 393224, 400786, 548444, 801572, 1096888, 1603144, 2605109, 5210218, 10420436, 20840872]

約数ペア:

[(1, 20840872), (2, 10420436), (4, 5210218), (8, 2605109), (13, 1603144), (19, 1096888), (26, 801572), (38, 548444), (52, 400786), (53, 393224), (76, 274222), (104, 200393), (106, 196612), (152, 137111), (199, 104728), (212, 98306), (247, 84376), (398, 52364), (424, 49153), (494, 42188), (689, 30248), (796, 26182), (988, 21094), (1007, 20696), (1378, 15124), (1592, 13091), (1976, 10547), (2014, 10348), (2587, 8056), (2756, 7562), (3781, 5512), (4028, 5174)]