399020

素因数分解:

$2^2\times 5^1\times {\mathrm{71}}^1\times {\mathrm{281}}^1$

素因数の和:361

約数の個数: 24

約数和(自身を含む): 852768

約数和(自身を除く): 453748

約数列:

[1, 2, 4, 5, 10, 20, 71, 142, 281, 284, 355, 562, 710, 1124, 1405, 1420, 2810, 5620, 19951, 39902, 79804, 99755, 199510, 399020]

約数ペア:

[(1, 399020), (2, 199510), (4, 99755), (5, 79804), (10, 39902), (20, 19951), (71, 5620), (142, 2810), (281, 1420), (284, 1405), (355, 1124), (562, 710)]