Base | Representation |
---|---|

bin | 100111100000… |

… | …0001101010111 |

3 | 1102222012002121 |

4 | 1033000031113 |

5 | 20300211411 |

6 | 2015520411 |

7 | 341014453 |

oct | 117001527 |

9 | 42865077 |

10 | 20710231 |

11 | 107659a3 |

12 | 6b29107 |

13 | 43a1799 |

14 | 2a71663 |

15 | 1c41571 |

hex | 13c0357 |

20710231 has 2 divisors, whose sum is σ = 20710232. Its totient is φ = 20710230.

The previous prime is 20710213. The next prime is 20710237. The reversal of 20710231 is 13201702.

It is a happy number.

Together with previous prime (20710213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20710231 - 2^{9} = 20709719 is a prime.

It is a super-2 number, since 2×20710231^{2} = 857827336146722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20710237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10355115 + 10355116.

It is an arithmetic number, because the mean of its divisors is an integer number (10355116).

Almost surely, 2^{20710231} is an apocalyptic number.

20710231 is a deficient number, since it is larger than the sum of its proper divisors (1).

20710231 is an equidigital number, since it uses as much as digits as its factorization.

20710231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 20710231 is about 4550.8494811409. The cubic root of 20710231 is about 274.6175664804.

Adding to 20710231 its reverse (13201702), we get a palindrome (33911933).

The spelling of 20710231 in words is "twenty million, seven hundred ten thousand, two hundred thirty-one".

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