21490280

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{23}}^1\times {\mathrm{47}}^1\times {\mathrm{71}}^1$

素因数の和:159

約数の個数: 128

約数和(自身を含む): 59719680

約数和(自身を除く): 38229400

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 23, 28, 35, 40, 46, 47, 56, 70, 71, 92, 94, 115, 140, 142, 161, 184, 188, 230, 235, 280, 284, 322, 329, 355, 376, 460, 470, 497, 568, 644, 658, 710, 805, 920, 940, 994, 1081, 1288, 1316, 1420, 1610, 1633, 1645, 1880, 1988, 2162, 2485, 2632, 2840, 3220, 3266, 3290, 3337, 3976, 4324, 4970, 5405, 6440, 6532, 6580, 6674, 7567, 8165, 8648, 9940, 10810, 11431, 13064, 13160, 13348, 15134, 16330, 16685, 19880, 21620, 22862, 23359, 26696, 30268, 32660, 33370, 37835, 43240, 45724, 46718, 57155, 60536, 65320, 66740, 75670, 76751, 91448, 93436, 114310, 116795, 133480, 151340, 153502, 186872, 228620, 233590, 302680, 307004, 383755, 457240, 467180, 537257, 614008, 767510, 934360, 1074514, 1535020, 2149028, 2686285, 3070040, 4298056, 5372570, 10745140, 21490280]

約数ペア:

[(1, 21490280), (2, 10745140), (4, 5372570), (5, 4298056), (7, 3070040), (8, 2686285), (10, 2149028), (14, 1535020), (20, 1074514), (23, 934360), (28, 767510), (35, 614008), (40, 537257), (46, 467180), (47, 457240), (56, 383755), (70, 307004), (71, 302680), (92, 233590), (94, 228620), (115, 186872), (140, 153502), (142, 151340), (161, 133480), (184, 116795), (188, 114310), (230, 93436), (235, 91448), (280, 76751), (284, 75670), (322, 66740), (329, 65320), (355, 60536), (376, 57155), (460, 46718), (470, 45724), (497, 43240), (568, 37835), (644, 33370), (658, 32660), (710, 30268), (805, 26696), (920, 23359), (940, 22862), (994, 21620), (1081, 19880), (1288, 16685), (1316, 16330), (1420, 15134), (1610, 13348), (1633, 13160), (1645, 13064), (1880, 11431), (1988, 10810), (2162, 9940), (2485, 8648), (2632, 8165), (2840, 7567), (3220, 6674), (3266, 6580), (3290, 6532), (3337, 6440), (3976, 5405), (4324, 4970)]