20771147 has 4 divisors (see below), whose sum is σ = 21441216. Its totient is φ = 20101080.

The previous prime is 20771141. The next prime is 20771159. The reversal of 20771147 is 74117702.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74117702 = 2 ⋅37058851.

It is a cyclic number.

It is not a de Polignac number, because 20771147 - 2⁴ = 20771131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20771141) 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, 334988 + ... + 335049.

It is an arithmetic number, because the mean of its divisors is an integer number (5360304).

Almost surely, 2^20771147 is an apocalyptic number.

20771147 is a deficient number, since it is larger than the sum of its proper divisors (670069).

20771147 is an equidigital number, since it uses as much as digits as its factorization.

20771147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670068.

The product of its (nonzero) digits is 2744, while the sum is 29.

The square root of 20771147 is about 4557.5373832806. The cubic root of 20771147 is about 274.8865515515.

Adding to 20771147 its reverse (74117702), we get a palindrome (94888849).

The spelling of 20771147 in words is "twenty million, seven hundred seventy-one thousand, one hundred forty-seven".