639812

素因数分解:

$2^2\times {\mathrm{17}}^1\times {\mathrm{97}}^2$

素因数の和:215

約数の個数: 18

約数和(自身を含む): 1197882

約数和(自身を除く): 558070

約数列:

[1, 2, 4, 17, 34, 68, 97, 194, 388, 1649, 3298, 6596, 9409, 18818, 37636, 159953, 319906, 639812]

約数ペア:

[(1, 639812), (2, 319906), (4, 159953), (17, 37636), (34, 18818), (68, 9409), (97, 6596), (194, 3298), (388, 1649)]