21315815

素因数分解:

$5^1\times {\mathrm{19}}^1\times {\mathrm{59}}^1\times {\mathrm{3803}}^1$

素因数の和:3886

約数の個数: 16

約数和(自身を含む): 27388800

約数和(自身を除く): 6072985

約数列:

[1, 5, 19, 59, 95, 295, 1121, 3803, 5605, 19015, 72257, 224377, 361285, 1121885, 4263163, 21315815]

約数ペア:

[(1, 21315815), (5, 4263163), (19, 1121885), (59, 361285), (95, 224377), (295, 72257), (1121, 19015), (3803, 5605)]