21253808

素因数分解:

$2^4\times {\mathrm{17}}^1\times {\mathrm{78139}}^1$

素因数の和:78164

約数の個数: 20

約数和(自身を含む): 43602120

約数和(自身を除く): 22348312

約数列:

[1, 2, 4, 8, 16, 17, 34, 68, 136, 272, 78139, 156278, 312556, 625112, 1250224, 1328363, 2656726, 5313452, 10626904, 21253808]

約数ペア:

[(1, 21253808), (2, 10626904), (4, 5313452), (8, 2656726), (16, 1328363), (17, 1250224), (34, 625112), (68, 312556), (136, 156278), (272, 78139)]