21287907

素因数分解:

$3^3\times {\mathrm{509}}^1\times {\mathrm{1549}}^1$

素因数の和:2067

約数の個数: 16

約数和(自身を含む): 31620000

約数和(自身を除く): 10332093

約数列:

[1, 3, 9, 27, 509, 1527, 1549, 4581, 4647, 13743, 13941, 41823, 788441, 2365323, 7095969, 21287907]

約数ペア:

[(1, 21287907), (3, 7095969), (9, 2365323), (27, 788441), (509, 41823), (1527, 13941), (1549, 13743), (4581, 4647)]