Search a number
-
+
20688007 is a prime number
BaseRepresentation
bin100111011101…
…0110010000111
31102221001121111
41032322302013
520244004012
62015225451
7340562614
oct116726207
942831544
1020688007
111075022a
126b18287
134394632
142a6750b
151c39ba7
hex13bac87

20688007 has 2 divisors, whose sum is σ = 20688008. Its totient is φ = 20688006.

The previous prime is 20688001. The next prime is 20688011. The reversal of 20688007 is 70088602.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-20688007 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20688007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20688001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10344003 + 10344004.

It is an arithmetic number, because the mean of its divisors is an integer number (10344004).

Almost surely, 220688007 is an apocalyptic number.

20688007 is a deficient number, since it is larger than the sum of its proper divisors (1).

20688007 is an equidigital number, since it uses as much as digits as its factorization.

20688007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 20688007 is about 4548.4070838042. The cubic root of 20688007 is about 274.5193012773.

The spelling of 20688007 in words is "twenty million, six hundred eighty-eight thousand, seven".