81555880

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{291271}}^1$

素因数の和:291289

約数の個数: 32

約数和(自身を含む): 209715840

約数和(自身を除く): 128159960

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 280, 291271, 582542, 1165084, 1456355, 2038897, 2330168, 2912710, 4077794, 5825420, 8155588, 10194485, 11650840, 16311176, 20388970, 40777940, 81555880]

約数ペア:

[(1, 81555880), (2, 40777940), (4, 20388970), (5, 16311176), (7, 11650840), (8, 10194485), (10, 8155588), (14, 5825420), (20, 4077794), (28, 2912710), (35, 2330168), (40, 2038897), (56, 1456355), (70, 1165084), (140, 582542), (280, 291271)]