20542125111 has 4 divisors (see below), whose sum is σ = 27389500152. Its totient is φ = 13694750072.

The previous prime is 20542125047. The next prime is 20542125137. The reversal of 20542125111 is 11152124502.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20542125111 - 2⁶ = 20542125047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20542125181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3423687516 + ... + 3423687521.

It is an arithmetic number, because the mean of its divisors is an integer number (6847375038).

Almost surely, 2^20542125111 is an apocalyptic number.

20542125111 is a deficient number, since it is larger than the sum of its proper divisors (6847375041).

20542125111 is an equidigital number, since it uses as much as digits as its factorization.

20542125111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6847375040.

The product of its (nonzero) digits is 800, while the sum is 24.

Adding to 20542125111 its reverse (11152124502), we get a palindrome (31694249613).

The spelling of 20542125111 in words is "twenty billion, five hundred forty-two million, one hundred twenty-five thousand, one hundred eleven".