20542111207 has 4 divisors (see below), whose sum is σ = 20542493160. Its totient is φ = 20541729256.

The previous prime is 20542111199. The next prime is 20542111217. The reversal of 20542111207 is 70211124502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70211124502 = 2 ⋅35105562251.

It is a cyclic number.

It is not a de Polignac number, because 20542111207 - 2³ = 20542111199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20542111217) 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, 93832 + ... + 223357.

It is an arithmetic number, because the mean of its divisors is an integer number (5135623290).

Almost surely, 2^20542111207 is an apocalyptic number.

20542111207 is a deficient number, since it is larger than the sum of its proper divisors (381953).

20542111207 is an equidigital number, since it uses as much as digits as its factorization.

20542111207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381952.

The product of its (nonzero) digits is 1120, while the sum is 25.

Adding to 20542111207 its reverse (70211124502), we get a palindrome (90753235709).

The spelling of 20542111207 in words is "twenty billion, five hundred forty-two million, one hundred eleven thousand, two hundred seven".