21654320

素因数分解:

$2^4\times 5^1\times {\mathrm{270679}}^1$

素因数の和:270692

約数の個数: 20

約数和(自身を含む): 50346480

約数和(自身を除く): 28692160

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 270679, 541358, 1082716, 1353395, 2165432, 2706790, 4330864, 5413580, 10827160, 21654320]

約数ペア:

[(1, 21654320), (2, 10827160), (4, 5413580), (5, 4330864), (8, 2706790), (10, 2165432), (16, 1353395), (20, 1082716), (40, 541358), (80, 270679)]