21520855

素因数分解:

$5^1\times {\mathrm{43}}^1\times {\mathrm{199}}^1\times {\mathrm{503}}^1$

素因数の和:750

約数の個数: 16

約数和(自身を含む): 26611200

約数和(自身を除く): 5090345

約数列:

[1, 5, 43, 199, 215, 503, 995, 2515, 8557, 21629, 42785, 100097, 108145, 500485, 4304171, 21520855]

約数ペア:

[(1, 21520855), (5, 4304171), (43, 500485), (199, 108145), (215, 100097), (503, 42785), (995, 21629), (2515, 8557)]