20705027 has 4 divisors (see below), whose sum is σ = 23662896. Its totient is φ = 17747160.

The previous prime is 20705021. The next prime is 20705029. The reversal of 20705027 is 72050702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72050702 = 2 ⋅36025351.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20705027 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20704993 and 20705011.

It is not an unprimeable number, because it can be changed into a prime (20705021) 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, 1478924 + ... + 1478937.

It is an arithmetic number, because the mean of its divisors is an integer number (5915724).

Almost surely, 2^20705027 is an apocalyptic number.

20705027 is a deficient number, since it is larger than the sum of its proper divisors (2957869).

20705027 is an equidigital number, since it uses as much as digits as its factorization.

20705027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2957868.

The product of its (nonzero) digits is 980, while the sum is 23.

The square root of 20705027 is about 4550.2776838343. The cubic root of 20705027 is about 274.5945628816.

Adding to 20705027 its reverse (72050702), we get a palindrome (92755729).

The spelling of 20705027 in words is "twenty million, seven hundred five thousand, twenty-seven".