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20711041 = 131739209
BaseRepresentation
bin100111100000…
…0011010000001
31102222020012121
41033000122001
520300223131
62015524241
7341020021
oct117003201
942866177
1020711041
111076656a
126b29681
1343a1c70
142a71a81
151c41911
hex13c0681

20711041 has 8 divisors (see below), whose sum is σ = 22435560. Its totient is φ = 19005312.

The previous prime is 20711029. The next prime is 20711051. The reversal of 20711041 is 14011702.

It can be written as a sum of positive squares in 4 ways, for example, as 1218816 + 19492225 = 1104^2 + 4415^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-20711041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20711051) 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, 2356 + ... + 6853.

It is an arithmetic number, because the mean of its divisors is an integer number (2804445).

It is the magic constant of a 346 × 346 magic square.

Almost surely, 220711041 is an apocalyptic number.

It is an amenable number.

20711041 is a deficient number, since it is larger than the sum of its proper divisors (1724519).

20711041 is a wasteful number, since it uses less digits than its factorization.

20711041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9395.

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 20711041 is about 4550.9384746445. The cubic root of 20711041 is about 274.6211466324.

Adding to 20711041 its reverse (14011702), we get a palindrome (34722743).

The spelling of 20711041 in words is "twenty million, seven hundred eleven thousand, forty-one".

Divisors: 1 13 173 2249 9209 119717 1593157 20711041