20125771 has 4 divisors (see below), whose sum is σ = 20163112. Its totient is φ = 20088432.

The previous prime is 20125751. The next prime is 20125799. The reversal of 20125771 is 17752102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17752102 = 2 ⋅8876051.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20125771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20125751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17850 + ... + 18943.

It is an arithmetic number, because the mean of its divisors is an integer number (5040778).

Almost surely, 2^20125771 is an apocalyptic number.

20125771 is a deficient number, since it is larger than the sum of its proper divisors (37341).

20125771 is an equidigital number, since it uses as much as digits as its factorization.

20125771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37340.

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 20125771 is about 4486.1755427090. The cubic root of 20125771 is about 272.0095647949.

Adding to 20125771 its reverse (17752102), we get a palindrome (37877873).

The spelling of 20125771 in words is "twenty million, one hundred twenty-five thousand, seven hundred seventy-one".