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

bin | 100111111000… |

… | …1010001111110 |

3 | 1110100101211000 |

4 | 1033301101332 |

5 | 20323124410 |

6 | 2024111130 |

7 | 342512454 |

oct | 117612176 |

9 | 43311730 |

10 | 20911230 |

11 | 10892a0a |

12 | 70054a6 |

13 | 4442112 |

14 | 2ac49d4 |

15 | 1c80dc0 |

hex | 13f147e |

20911230 has 64 divisors (see below), whose sum is σ = 57153600. Its totient is φ = 5437440.

The previous prime is 20911223. The next prime is 20911243. The reversal of 20911230 is 3211902.

It is a happy number.

It is a super-2 number, since 2×20911230^{2} = 874559080225800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10126 + ... + 12014.

It is an arithmetic number, because the mean of its divisors is an integer number (893025).

Almost surely, 2^{20911230} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20911230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28576800).

20911230 is an abundant number, since it is smaller than the sum of its proper divisors (36242370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20911230 is a wasteful number, since it uses less digits than its factorization.

20911230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1946 (or 1940 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 20911230 is about 4572.8798366019. The cubic root of 20911230 is about 275.5031230329.

It can be divided in two parts, 2091 and 1230, that added together give a triangular number (3321 = T_{81}).

The spelling of 20911230 in words is "twenty million, nine hundred eleven thousand, two hundred thirty".

Divisors: 1 2 3 5 6 9 10 15 18 27 30 41 45 54 82 90 123 135 205 246 270 369 410 615 738 1107 1230 1845 1889 2214 3690 3778 5535 5667 9445 11070 11334 17001 18890 28335 34002 51003 56670 77449 85005 102006 154898 170010 232347 255015 387245 464694 510030 697041 774490 1161735 1394082 2091123 2323470 3485205 4182246 6970410 10455615 20911230

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