21381820

素因数分解:

$2^2\times 5^1\times {\mathrm{131}}^1\times {\mathrm{8161}}^1$

素因数の和:8301

約数の個数: 24

約数和(自身を含む): 45250128

約数和(自身を除く): 23868308

約数列:

[1, 2, 4, 5, 10, 20, 131, 262, 524, 655, 1310, 2620, 8161, 16322, 32644, 40805, 81610, 163220, 1069091, 2138182, 4276364, 5345455, 10690910, 21381820]

約数ペア:

[(1, 21381820), (2, 10690910), (4, 5345455), (5, 4276364), (10, 2138182), (20, 1069091), (131, 163220), (262, 81610), (524, 40805), (655, 32644), (1310, 16322), (2620, 8161)]