21679259

素因数分解:

$7^1\times {\mathrm{79}}^1\times {\mathrm{197}}^1\times {\mathrm{199}}^1$

素因数の和:482

約数の個数: 16

約数和(自身を含む): 25344000

約数和(自身を除く): 3664741

約数列:

[1, 7, 79, 197, 199, 553, 1379, 1393, 15563, 15721, 39203, 108941, 110047, 274421, 3097037, 21679259]

約数ペア:

[(1, 21679259), (7, 3097037), (79, 274421), (197, 110047), (199, 108941), (553, 39203), (1379, 15721), (1393, 15563)]