20681680

素因数分解:

$2^4\times 5^1\times {\mathrm{258521}}^1$

素因数の和:258534

約数の個数: 20

約数和(自身を含む): 48085092

約数和(自身を除く): 27403412

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 258521, 517042, 1034084, 1292605, 2068168, 2585210, 4136336, 5170420, 10340840, 20681680]

約数ペア:

[(1, 20681680), (2, 10340840), (4, 5170420), (5, 4136336), (8, 2585210), (10, 2068168), (16, 1292605), (20, 1034084), (40, 517042), (80, 258521)]