21781400

素因数分解:

$2^3\times 5^2\times {\mathrm{108907}}^1$

素因数の和:108923

約数の個数: 24

約数和(自身を含む): 50642220

約数和(自身を除く): 28860820

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 200, 108907, 217814, 435628, 544535, 871256, 1089070, 2178140, 2722675, 4356280, 5445350, 10890700, 21781400]

約数ペア:

[(1, 21781400), (2, 10890700), (4, 5445350), (5, 4356280), (8, 2722675), (10, 2178140), (20, 1089070), (25, 871256), (40, 544535), (50, 435628), (100, 217814), (200, 108907)]