21505328

素因数分解:

$2^4\times {\mathrm{13}}^1\times {\mathrm{103391}}^1$

素因数の和:103412

約数の個数: 20

約数和(自身を含む): 44872128

約数和(自身を除く): 23366800

約数列:

[1, 2, 4, 8, 13, 16, 26, 52, 104, 208, 103391, 206782, 413564, 827128, 1344083, 1654256, 2688166, 5376332, 10752664, 21505328]

約数ペア:

[(1, 21505328), (2, 10752664), (4, 5376332), (8, 2688166), (13, 1654256), (16, 1344083), (26, 827128), (52, 413564), (104, 206782), (208, 103391)]