18991719

素因数分解:

$3^3\times {\mathrm{71}}^1\times {\mathrm{9907}}^1$

素因数の和:9987

約数の個数: 16

約数和(自身を含む): 28535040

約数和(自身を除く): 9543321

約数列:

[1, 3, 9, 27, 71, 213, 639, 1917, 9907, 29721, 89163, 267489, 703397, 2110191, 6330573, 18991719]

約数ペア:

[(1, 18991719), (3, 6330573), (9, 2110191), (27, 703397), (71, 267489), (213, 89163), (639, 29721), (1917, 9907)]