20980988

素因数分解:

$2^2\times 7^1\times {\mathrm{47}}^1\times {\mathrm{107}}^1\times {\mathrm{149}}^1$

素因数の和:314

約数の個数: 48

約数和(自身を含む): 43545600

約数和(自身を除く): 22564612

約数列:

[1, 2, 4, 7, 14, 28, 47, 94, 107, 149, 188, 214, 298, 329, 428, 596, 658, 749, 1043, 1316, 1498, 2086, 2996, 4172, 5029, 7003, 10058, 14006, 15943, 20116, 28012, 31886, 35203, 49021, 63772, 70406, 98042, 111601, 140812, 196084, 223202, 446404, 749321, 1498642, 2997284, 5245247, 10490494, 20980988]

約数ペア:

[(1, 20980988), (2, 10490494), (4, 5245247), (7, 2997284), (14, 1498642), (28, 749321), (47, 446404), (94, 223202), (107, 196084), (149, 140812), (188, 111601), (214, 98042), (298, 70406), (329, 63772), (428, 49021), (596, 35203), (658, 31886), (749, 28012), (1043, 20116), (1316, 15943), (1498, 14006), (2086, 10058), (2996, 7003), (4172, 5029)]