18710840

素因数分解:

$2^3\times 5^1\times {\mathrm{509}}^1\times {\mathrm{919}}^1$

素因数の和:1439

約数の個数: 32

約数和(自身を含む): 42228000

約数和(自身を除く): 23517160

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 509, 919, 1018, 1838, 2036, 2545, 3676, 4072, 4595, 5090, 7352, 9190, 10180, 18380, 20360, 36760, 467771, 935542, 1871084, 2338855, 3742168, 4677710, 9355420, 18710840]

約数ペア:

[(1, 18710840), (2, 9355420), (4, 4677710), (5, 3742168), (8, 2338855), (10, 1871084), (20, 935542), (40, 467771), (509, 36760), (919, 20360), (1018, 18380), (1838, 10180), (2036, 9190), (2545, 7352), (3676, 5090), (4072, 4595)]