19782920

素因数分解:

$2^3\times 5^1\times {\mathrm{89}}^1\times {\mathrm{5557}}^1$

素因数の和:5657

約数の個数: 32

約数和(自身を含む): 45019800

約数和(自身を除く): 25236880

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 89, 178, 356, 445, 712, 890, 1780, 3560, 5557, 11114, 22228, 27785, 44456, 55570, 111140, 222280, 494573, 989146, 1978292, 2472865, 3956584, 4945730, 9891460, 19782920]

約数ペア:

[(1, 19782920), (2, 9891460), (4, 4945730), (5, 3956584), (8, 2472865), (10, 1978292), (20, 989146), (40, 494573), (89, 222280), (178, 111140), (356, 55570), (445, 44456), (712, 27785), (890, 22228), (1780, 11114), (3560, 5557)]