21301955

素因数分解:

$5^1\times {\mathrm{79}}^1\times {\mathrm{199}}^1\times {\mathrm{271}}^1$

素因数の和:554

約数の個数: 16

約数和(自身を含む): 26112000

約数和(自身を除く): 4810045

約数列:

[1, 5, 79, 199, 271, 395, 995, 1355, 15721, 21409, 53929, 78605, 107045, 269645, 4260391, 21301955]

約数ペア:

[(1, 21301955), (5, 4260391), (79, 269645), (199, 107045), (271, 78605), (395, 53929), (995, 21409), (1355, 15721)]