数表 — 整数
<< 20 21 22 23 24 25 26 27 28 29 >>
<< 0 10 20 30 40 50 60 70 80 90 >>
小写
二十（廿）
大写
貳拾（念）
质因数分解
罗马数字
XX
二进制
10100
八进制
24
十六进制
14
20（二十）是19与21之间的自然数。
目录
1 数学性质
2 在科学中
3 在人类文化中
4 參考資料
编辑 数学性质
合数：其因數有：1，2，4，5，10，20
第3個過剩數
首4個三角形數之和，故它為四面體數。
20是十进制中的哈沙德數和自我數。
6個頂點的有根樹的數目。
正二十面體是面數最多的正多面體。
编辑 在科学中
鈣的原子序數
任意组合的魔方都可以在20步内还原，现在上帝的數字正式定为20。[1][2]
编辑 在人类文化中
貨幣中常用的面額，如20元、20鎊。在香港，港幣20元鈔票是發行量最多的香港鈔票之一（以鈔票編號計算）。
编辑 參考資料
^ [1]
^ God's Number is 20/
這是關於數的小作品。你可以通过编辑與修订扩充其内容。
Penrith humiliate NRL Bulldogs 20-6
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20
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