639964

素因数分解:

$2^2\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{397}}^1$

素因数の和:445

約数の個数: 24

約数和(自身を含む): 1248128

約数和(自身を除く): 608164

約数列:

[1, 2, 4, 13, 26, 31, 52, 62, 124, 397, 403, 794, 806, 1588, 1612, 5161, 10322, 12307, 20644, 24614, 49228, 159991, 319982, 639964]

約数ペア:

[(1, 639964), (2, 319982), (4, 159991), (13, 49228), (26, 24614), (31, 20644), (52, 12307), (62, 10322), (124, 5161), (397, 1612), (403, 1588), (794, 806)]