20679617 has 12 divisors (see below), whose sum is σ = 24418800. Its totient is φ = 17458056.

The previous prime is 20679613. The next prime is 20679641. The reversal of 20679617 is 71697602.

It is not a de Polignac number, because 20679617 - 2² = 20679613 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20679613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 134 + ... + 6432.

It is an arithmetic number, because the mean of its divisors is an integer number (2034900).

Almost surely, 2^20679617 is an apocalyptic number.

It is an amenable number.

20679617 is a deficient number, since it is larger than the sum of its proper divisors (3739183).

20679617 is an equidigital number, since it uses as much as digits as its factorization.

20679617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6380 (or 6373 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 20679617 is about 4547.4846893640. The cubic root of 20679617 is about 274.4821859192.

The spelling of 20679617 in words is "twenty million, six hundred seventy-nine thousand, six hundred seventeen".