128779600

素因数分解:

$2^4\times 5^2\times {\mathrm{321949}}^1$

素因数の和:321967

約数の個数: 30

約数和(自身を含む): 309393950

約数和(自身を除く): 180614350

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 400, 321949, 643898, 1287796, 1609745, 2575592, 3219490, 5151184, 6438980, 8048725, 12877960, 16097450, 25755920, 32194900, 64389800, 128779600]

約数ペア:

[(1, 128779600), (2, 64389800), (4, 32194900), (5, 25755920), (8, 16097450), (10, 12877960), (16, 8048725), (20, 6438980), (25, 5151184), (40, 3219490), (50, 2575592), (80, 1609745), (100, 1287796), (200, 643898), (400, 321949)]