159980

素因数分解:

$2^2\times 5^1\times {\mathrm{19}}^1\times {\mathrm{421}}^1$

素因数の和:449

約数の個数: 24

約数和(自身を含む): 354480

約数和(自身を除く): 194500

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 76, 95, 190, 380, 421, 842, 1684, 2105, 4210, 7999, 8420, 15998, 31996, 39995, 79990, 159980]

約数ペア:

[(1, 159980), (2, 79990), (4, 39995), (5, 31996), (10, 15998), (19, 8420), (20, 7999), (38, 4210), (76, 2105), (95, 1684), (190, 842), (380, 421)]