20606689 has 8 divisors (see below), whose sum is σ = 21549312. Its totient is φ = 19668000.

The previous prime is 20606681. The next prime is 20606711. The reversal of 20606689 is 98660602.

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

It is a cyclic number.

It is not a de Polignac number, because 20606689 - 2³ = 20606681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20606681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16677 + ... + 17869.

It is an arithmetic number, because the mean of its divisors is an integer number (2693664).

Almost surely, 2^20606689 is an apocalyptic number.

It is an amenable number.

20606689 is a deficient number, since it is larger than the sum of its proper divisors (942623).

20606689 is a wasteful number, since it uses less digits than its factorization.

20606689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1967.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 20606689 is about 4539.4591087485. The cubic root of 20606689 is about 274.1591461841.

The spelling of 20606689 in words is "twenty million, six hundred six thousand, six hundred eighty-nine".