21815440

素因数分解:

$2^4\times 5^1\times {\mathrm{272693}}^1$

素因数の和:272706

約数の個数: 20

約数和(自身を含む): 50721084

約数和(自身を除く): 28905644

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 272693, 545386, 1090772, 1363465, 2181544, 2726930, 4363088, 5453860, 10907720, 21815440]

約数ペア:

[(1, 21815440), (2, 10907720), (4, 5453860), (5, 4363088), (8, 2726930), (10, 2181544), (16, 1363465), (20, 1090772), (40, 545386), (80, 272693)]