128540408020

素因数分解:

$2^2\times 5^1\times {\mathrm{6427020401}}^1$

素因数の和:6427020410

約数の個数: 12

約数和(自身を含む): 269934856884

約数和(自身を除く): 141394448864

約数列:

[1, 2, 4, 5, 10, 20, 6427020401, 12854040802, 25708081604, 32135102005, 64270204010, 128540408020]

約数ペア:

[(1, 128540408020), (2, 64270204010), (4, 32135102005), (5, 25708081604), (10, 12854040802), (20, 6427020401)]