128421560

素因数分解:

$2^3\times 5^1\times {\mathrm{397}}^1\times {\mathrm{8087}}^1$

素因数の和:8495

約数の個数: 32

約数和(自身を含む): 289712160

約数和(自身を除く): 161290600

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 397, 794, 1588, 1985, 3176, 3970, 7940, 8087, 15880, 16174, 32348, 40435, 64696, 80870, 161740, 323480, 3210539, 6421078, 12842156, 16052695, 25684312, 32105390, 64210780, 128421560]

約数ペア:

[(1, 128421560), (2, 64210780), (4, 32105390), (5, 25684312), (8, 16052695), (10, 12842156), (20, 6421078), (40, 3210539), (397, 323480), (794, 161740), (1588, 80870), (1985, 64696), (3176, 40435), (3970, 32348), (7940, 16174), (8087, 15880)]