20661284

素因数分解:

$2^2\times 7^1\times {\mathrm{19}}^1\times {\mathrm{71}}^1\times {\mathrm{547}}^1$

素因数の和:648

約数の個数: 48

約数和(自身を含む): 44190720

約数和(自身を除く): 23529436

約数列:

[1, 2, 4, 7, 14, 19, 28, 38, 71, 76, 133, 142, 266, 284, 497, 532, 547, 994, 1094, 1349, 1988, 2188, 2698, 3829, 5396, 7658, 9443, 10393, 15316, 18886, 20786, 37772, 38837, 41572, 72751, 77674, 145502, 155348, 271859, 291004, 543718, 737903, 1087436, 1475806, 2951612, 5165321, 10330642, 20661284]

約数ペア:

[(1, 20661284), (2, 10330642), (4, 5165321), (7, 2951612), (14, 1475806), (19, 1087436), (28, 737903), (38, 543718), (71, 291004), (76, 271859), (133, 155348), (142, 145502), (266, 77674), (284, 72751), (497, 41572), (532, 38837), (547, 37772), (994, 20786), (1094, 18886), (1349, 15316), (1988, 10393), (2188, 9443), (2698, 7658), (3829, 5396)]