640336

素因数分解:

$2^4\times {\mathrm{31}}^1\times {\mathrm{1291}}^1$

素因数の和:1330

約数の個数: 20

約数和(自身を含む): 1281664

約数和(自身を除く): 641328

約数列:

[1, 2, 4, 8, 16, 31, 62, 124, 248, 496, 1291, 2582, 5164, 10328, 20656, 40021, 80042, 160084, 320168, 640336]

約数ペア:

[(1, 640336), (2, 320168), (4, 160084), (8, 80042), (16, 40021), (31, 20656), (62, 10328), (124, 5164), (248, 2582), (496, 1291)]