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20694013 = 891571481
BaseRepresentation
bin100111011110…
…0001111111101
31102221100211221
41032330033331
520244202023
62015313341
7340616254
oct116741775
942840757
1020694013
111075479a
126b1b851
1343972a2
142a6979b
151c3b85d
hex13bc3fd

20694013 has 8 divisors (see below), whose sum is σ = 21074040. Its totient is φ = 20317440.

The previous prime is 20693999. The next prime is 20694017. The reversal of 20694013 is 31049602.

It can be written as a sum of positive squares in 4 ways, for example, as 145924 + 20548089 = 382^2 + 4533^2 .

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-20694013 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 (20694017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13233 + ... + 14713.

It is an arithmetic number, because the mean of its divisors is an integer number (2634255).

Almost surely, 220694013 is an apocalyptic number.

It is an amenable number.

20694013 is a deficient number, since it is larger than the sum of its proper divisors (380027).

20694013 is a wasteful number, since it uses less digits than its factorization.

20694013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1727.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 20694013 is about 4549.0672670340. The cubic root of 20694013 is about 274.5458642258.

The spelling of 20694013 in words is "twenty million, six hundred ninety-four thousand, thirteen".

Divisors: 1 89 157 1481 13973 131809 232517 20694013