21517808

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{103451}}^1$

素因数の和:103472

約数の個数: 20

約数和(自身を含む): 44898168

約数和(自身を除く): 23380360

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 104, 208, 103451, 206902, 413804, 827608, 1344863, 1655216, 2689726, 5379452, 10758904, 21517808]

約数ペア:

[(1, 21517808), (2, 10758904), (4, 5379452), (8, 2689726), (13, 1655216), (16, 1344863), (26, 827608), (52, 413804), (104, 206902), (208, 103451)]