21788720

素因数分解:

$2^4\times 5^1\times {\mathrm{272359}}^1$

素因数の和:272372

約数の個数: 20

約数和(自身を含む): 50658960

約数和(自身を除く): 28870240

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 80, 272359, 544718, 1089436, 1361795, 2178872, 2723590, 4357744, 5447180, 10894360, 21788720]

約数ペア:

[(1, 21788720), (2, 10894360), (4, 5447180), (5, 4357744), (8, 2723590), (10, 2178872), (16, 1361795), (20, 1089436), (40, 544718), (80, 272359)]