20517670 has 8 divisors (see below), whose sum is σ = 36931824. Its totient is φ = 8207064.

The previous prime is 20517661. The next prime is 20517677. The reversal of 20517670 is 7671502.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20517677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1025874 + ... + 1025893.

It is an arithmetic number, because the mean of its divisors is an integer number (4616478).

Almost surely, 2^20517670 is an apocalyptic number.

20517670 is a deficient number, since it is larger than the sum of its proper divisors (16414154).

20517670 is a wasteful number, since it uses less digits than its factorization.

20517670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2051774.

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 20517670 is about 4529.6434738288. The cubic root of 20517670 is about 273.7637955837.

The spelling of 20517670 in words is "twenty million, five hundred seventeen thousand, six hundred seventy".