19989920

素因数分解:

$2^5\times 5^1\times {\mathrm{101}}^1\times {\mathrm{1237}}^1$

素因数の和:1353

約数の個数: 48

約数和(自身を含む): 47732328

約数和(自身を除く): 27742408

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 101, 160, 202, 404, 505, 808, 1010, 1237, 1616, 2020, 2474, 3232, 4040, 4948, 6185, 8080, 9896, 12370, 16160, 19792, 24740, 39584, 49480, 98960, 124937, 197920, 249874, 499748, 624685, 999496, 1249370, 1998992, 2498740, 3997984, 4997480, 9994960, 19989920]

約数ペア:

[(1, 19989920), (2, 9994960), (4, 4997480), (5, 3997984), (8, 2498740), (10, 1998992), (16, 1249370), (20, 999496), (32, 624685), (40, 499748), (80, 249874), (101, 197920), (160, 124937), (202, 98960), (404, 49480), (505, 39584), (808, 24740), (1010, 19792), (1237, 16160), (1616, 12370), (2020, 9896), (2474, 8080), (3232, 6185), (4040, 4948)]