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20161271 = 132367429
BaseRepresentation
bin100110011101…
…0001011110111
31101221022001202
41030322023313
520130130041
62000043115
7333240134
oct114721367
941838052
1020161271
1110420509
12690349b
13423b960
14296b58b
151b83a9b
hex133a2f7

20161271 has 8 divisors (see below), whose sum is σ = 22656480. Its totient is φ = 17800992.

The previous prime is 20161243. The next prime is 20161277. The reversal of 20161271 is 17216102.

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 20161271 - 218 = 19899127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20161277) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33416 + ... + 34013.

It is an arithmetic number, because the mean of its divisors is an integer number (2832060).

Almost surely, 220161271 is an apocalyptic number.

20161271 is a deficient number, since it is larger than the sum of its proper divisors (2495209).

20161271 is a wasteful number, since it uses less digits than its factorization.

20161271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67465.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 20161271 is about 4490.1303989973. The cubic root of 20161271 is about 272.1694040954.

Adding to 20161271 its reverse (17216102), we get a palindrome (37377373).

The spelling of 20161271 in words is "twenty million, one hundred sixty-one thousand, two hundred seventy-one".

Divisors: 1 13 23 299 67429 876577 1550867 20161271