80777780

素因数分解:

$2^2\times 5^1\times {\mathrm{101}}^1\times {\mathrm{39989}}^1$

素因数の和:40099

約数の個数: 24

約数和(自身を含む): 171317160

約数和(自身を除く): 90539380

約数列:

[1, 2, 4, 5, 10, 20, 101, 202, 404, 505, 1010, 2020, 39989, 79978, 159956, 199945, 399890, 799780, 4038889, 8077778, 16155556, 20194445, 40388890, 80777780]

約数ペア:

[(1, 80777780), (2, 40388890), (4, 20194445), (5, 16155556), (10, 8077778), (20, 4038889), (101, 799780), (202, 399890), (404, 199945), (505, 159956), (1010, 79978), (2020, 39989)]