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20731271 = 1112311531
BaseRepresentation
bin100111100010…
…1010110000111
31110000020221212
41033011112013
520301400041
62020202035
7341133011
oct117052607
943006855
1020731271
111077a790
126b3931b
1343ab232
142a791b1
151c478eb
hex13c5587

20731271 has 8 divisors (see below), whose sum is σ = 22649088. Its totient is φ = 18819000.

The previous prime is 20731267. The next prime is 20731273. The reversal of 20731271 is 17213702.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20731271 - 22 = 20731267 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20731273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12776 + ... + 14306.

It is an arithmetic number, because the mean of its divisors is an integer number (2831136).

Almost surely, 220731271 is an apocalyptic number.

20731271 is a deficient number, since it is larger than the sum of its proper divisors (1917817).

20731271 is a wasteful number, since it uses less digits than its factorization.

20731271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2773.

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 20731271 is about 4553.1605506505. The cubic root of 20731271 is about 274.7105317729.

Adding to 20731271 its reverse (17213702), we get a palindrome (37944973).

The spelling of 20731271 in words is "twenty million, seven hundred thirty-one thousand, two hundred seventy-one".

Divisors: 1 11 1231 1531 13541 16841 1884661 20731271