20689027 has 4 divisors (see below), whose sum is σ = 21079440. Its totient is φ = 20298616.

The previous prime is 20689013. The next prime is 20689049. The reversal of 20689027 is 72098602.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72098602 = 2 ⋅36049301.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20689027 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20688983 and 20689001.

It is not an unprimeable number, because it can be changed into a prime (20689087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 195127 + ... + 195232.

It is an arithmetic number, because the mean of its divisors is an integer number (5269860).

Almost surely, 2^20689027 is an apocalyptic number.

20689027 is a deficient number, since it is larger than the sum of its proper divisors (390413).

20689027 is an equidigital number, since it uses as much as digits as its factorization.

20689027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390412.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 20689027 is about 4548.5192095890. The cubic root of 20689027 is about 274.5238128297.

The spelling of 20689027 in words is "twenty million, six hundred eighty-nine thousand, twenty-seven".