80019890

素因数分解:

$2^1\times 5^1\times {\mathrm{79}}^1\times {\mathrm{199}}^1\times {\mathrm{509}}^1$

素因数の和:794

約数の個数: 32

約数和(自身を含む): 146880000

約数和(自身を除く): 66860110

約数列:

[1, 2, 5, 10, 79, 158, 199, 395, 398, 509, 790, 995, 1018, 1990, 2545, 5090, 15721, 31442, 40211, 78605, 80422, 101291, 157210, 201055, 202582, 402110, 506455, 1012910, 8001989, 16003978, 40009945, 80019890]

約数ペア:

[(1, 80019890), (2, 40009945), (5, 16003978), (10, 8001989), (79, 1012910), (158, 506455), (199, 402110), (395, 202582), (398, 201055), (509, 157210), (790, 101291), (995, 80422), (1018, 78605), (1990, 40211), (2545, 31442), (5090, 15721)]