21109864

素因数分解:

$2^3\times {\mathrm{131}}^1\times {\mathrm{20143}}^1$

素因数の和:20280

約数の個数: 16

約数和(自身を含む): 39885120

約数和(自身を除く): 18775256

約数列:

[1, 2, 4, 8, 131, 262, 524, 1048, 20143, 40286, 80572, 161144, 2638733, 5277466, 10554932, 21109864]

約数ペア:

[(1, 21109864), (2, 10554932), (4, 5277466), (8, 2638733), (131, 161144), (262, 80572), (524, 40286), (1048, 20143)]