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20688067 = 31412397
BaseRepresentation
bin100111011101…
…0110011000011
31102221001200201
41032322303003
520244004232
62015230031
7340563031
oct116726303
942831621
1020688067
1110750284
126b18317
13439467a
142a67551
151c39be7
hex13bacc3

20688067 has 12 divisors (see below), whose sum is σ = 21944128. Its totient is φ = 19483200.

The previous prime is 20688043. The next prime is 20688071. The reversal of 20688067 is 76088602.

It is not a de Polignac number, because 20688067 - 27 = 20687939 is a prime.

It is a super-2 number, since 2×206880672 = 855992232392978, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20688007) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51913 + ... + 52309.

Almost surely, 220688067 is an apocalyptic number.

20688067 is a deficient number, since it is larger than the sum of its proper divisors (1256061).

20688067 is an equidigital number, since it uses as much as digits as its factorization.

20688067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510 (or 469 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 20688067 is about 4548.4136795151. The cubic root of 20688067 is about 274.5195666668.

The spelling of 20688067 in words is "twenty million, six hundred eighty-eight thousand, sixty-seven".

Divisors: 1 31 41 397 1271 1681 12307 16277 52111 504587 667357 20688067