19917488

素因数分解:

$2^4\times {\mathrm{71}}^1\times {\mathrm{89}}^1\times {\mathrm{197}}^1$

素因数の和:365

約数の個数: 40

約数和(自身を含む): 39774240

約数和(自身を除く): 19856752

約数列:

[1, 2, 4, 8, 16, 71, 89, 142, 178, 197, 284, 356, 394, 568, 712, 788, 1136, 1424, 1576, 3152, 6319, 12638, 13987, 17533, 25276, 27974, 35066, 50552, 55948, 70132, 101104, 111896, 140264, 223792, 280528, 1244843, 2489686, 4979372, 9958744, 19917488]

約数ペア:

[(1, 19917488), (2, 9958744), (4, 4979372), (8, 2489686), (16, 1244843), (71, 280528), (89, 223792), (142, 140264), (178, 111896), (197, 101104), (284, 70132), (356, 55948), (394, 50552), (568, 35066), (712, 27974), (788, 25276), (1136, 17533), (1424, 13987), (1576, 12638), (3152, 6319)]