19982740

素因数分解:

$2^2\times 5^1\times {\mathrm{29}}^1\times {\mathrm{131}}^1\times {\mathrm{263}}^1$

素因数の和:432

約数の個数: 48

約数和(自身を含む): 43908480

約数和(自身を除く): 23925740

約数列:

[1, 2, 4, 5, 10, 20, 29, 58, 116, 131, 145, 262, 263, 290, 524, 526, 580, 655, 1052, 1310, 1315, 2620, 2630, 3799, 5260, 7598, 7627, 15196, 15254, 18995, 30508, 34453, 37990, 38135, 68906, 75980, 76270, 137812, 152540, 172265, 344530, 689060, 999137, 1998274, 3996548, 4995685, 9991370, 19982740]

約数ペア:

[(1, 19982740), (2, 9991370), (4, 4995685), (5, 3996548), (10, 1998274), (20, 999137), (29, 689060), (58, 344530), (116, 172265), (131, 152540), (145, 137812), (262, 76270), (263, 75980), (290, 68906), (524, 38135), (526, 37990), (580, 34453), (655, 30508), (1052, 18995), (1310, 15254), (1315, 15196), (2620, 7627), (2630, 7598), (3799, 5260)]