21281.000000

素因数分解:

$3^3\times {\mathrm{23}}^1\times {\mathrm{877}}^1$

素因数の和:909

約数の個数: 16

約数和(自身を含む): 842880

約数和(自身を除く): 298263

約数列:

[1, 3, 9, 23, 27, 69, 207, 621, 877, 2631, 7893, 20171, 23679, 60513, 181539, 544617]

約数ペア:

[(1, 544617), (3, 181539), (9, 60513), (23, 23679), (27, 20171), (69, 7893), (207, 2631), (621, 877)]