639344

素因数分解:

$2^4\times {\mathrm{31}}^1\times {\mathrm{1289}}^1$

素因数の和:1328

約数の個数: 20

約数和(自身を含む): 1279680

約数和(自身を除く): 640336

約数列:

[1, 2, 4, 8, 16, 31, 62, 124, 248, 496, 1289, 2578, 5156, 10312, 20624, 39959, 79918, 159836, 319672, 639344]

約数ペア:

[(1, 639344), (2, 319672), (4, 159836), (8, 79918), (16, 39959), (31, 20624), (62, 10312), (124, 5156), (248, 2578), (496, 1289)]