21431905

素因数分解:

$5^1\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{20509}}^1$

素因数の和:20544

約数の個数: 16

約数和(自身を含む): 29534400

約数和(自身を除く): 8102495

約数列:

[1, 5, 11, 19, 55, 95, 209, 1045, 20509, 102545, 225599, 389671, 1127995, 1948355, 4286381, 21431905]

約数ペア:

[(1, 21431905), (5, 4286381), (11, 1948355), (19, 1127995), (55, 389671), (95, 225599), (209, 102545), (1045, 20509)]