20687919

素因数分解:

$3^1\times 7^1\times {\mathrm{127}}^1\times {\mathrm{7757}}^1$

素因数の和:7894

約数の個数: 16

約数和(自身を含む): 31776768

約数和(自身を除く): 11088849

約数列:

[1, 3, 7, 21, 127, 381, 889, 2667, 7757, 23271, 54299, 162897, 985139, 2955417, 6895973, 20687919]

約数ペア:

[(1, 20687919), (3, 6895973), (7, 2955417), (21, 985139), (127, 162897), (381, 54299), (889, 23271), (2667, 7757)]