20199440

素因数分解:

$2^4\times 5^1\times {\mathrm{89}}^1\times {\mathrm{2837}}^1$

素因数の和:2939

約数の個数: 40

約数和(自身を含む): 47508120

約数和(自身を除く): 27308680

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 89, 178, 356, 445, 712, 890, 1424, 1780, 2837, 3560, 5674, 7120, 11348, 14185, 22696, 28370, 45392, 56740, 113480, 226960, 252493, 504986, 1009972, 1262465, 2019944, 2524930, 4039888, 5049860, 10099720, 20199440]

約数ペア:

[(1, 20199440), (2, 10099720), (4, 5049860), (5, 4039888), (8, 2524930), (10, 2019944), (16, 1262465), (20, 1009972), (40, 504986), (80, 252493), (89, 226960), (178, 113480), (356, 56740), (445, 45392), (712, 28370), (890, 22696), (1424, 14185), (1780, 11348), (2837, 7120), (3560, 5674)]