21328223

素因数分解:

$7^1\times {\mathrm{61}}^1\times {\mathrm{199}}^1\times {\mathrm{251}}^1$

素因数の和:518

約数の個数: 16

約数和(自身を含む): 24998400

約数和(自身を除く): 3670177

約数列:

[1, 7, 61, 199, 251, 427, 1393, 1757, 12139, 15311, 49949, 84973, 107177, 349643, 3046889, 21328223]

約数ペア:

[(1, 21328223), (7, 3046889), (61, 349643), (199, 107177), (251, 84973), (427, 49949), (1393, 15311), (1757, 12139)]