129681280

素因数分解:

$2^7\times 5^1\times {\mathrm{202627}}^1$

素因数の和:202646

約数の個数: 32

約数和(自身を含む): 310020840

約数和(自身を除く): 180339560

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640, 202627, 405254, 810508, 1013135, 1621016, 2026270, 3242032, 4052540, 6484064, 8105080, 12968128, 16210160, 25936256, 32420320, 64840640, 129681280]

約数ペア:

[(1, 129681280), (2, 64840640), (4, 32420320), (5, 25936256), (8, 16210160), (10, 12968128), (16, 8105080), (20, 6484064), (32, 4052540), (40, 3242032), (64, 2026270), (80, 1621016), (128, 1013135), (160, 810508), (320, 405254), (640, 202627)]