640784

素因数分解:

$2^4\times {\mathrm{29}}^1\times {\mathrm{1381}}^1$

素因数の和:1418

約数の個数: 20

約数和(自身を含む): 1285260

約数和(自身を除く): 644476

約数列:

[1, 2, 4, 8, 16, 29, 58, 116, 232, 464, 1381, 2762, 5524, 11048, 22096, 40049, 80098, 160196, 320392, 640784]

約数ペア:

[(1, 640784), (2, 320392), (4, 160196), (8, 80098), (16, 40049), (29, 22096), (58, 11048), (116, 5524), (232, 2762), (464, 1381)]