128423920

素因数分解:

$2^4\times 5^1\times {\mathrm{1605299}}^1$

素因数の和:1605312

約数の個数: 20

約数和(自身を含む): 298585800

約数和(自身を除く): 170161880

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 1605299, 3210598, 6421196, 8026495, 12842392, 16052990, 25684784, 32105980, 64211960, 128423920]

約数ペア:

[(1, 128423920), (2, 64211960), (4, 32105980), (5, 25684784), (8, 16052990), (10, 12842392), (16, 8026495), (20, 6421196), (40, 3210598), (80, 1605299)]