20112220187 has 2 divisors, whose sum is σ = 20112220188. Its totient is φ = 20112220186.

The previous prime is 20112220171. The next prime is 20112220217. The reversal of 20112220187 is 78102221102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20112220187 - 2⁴ = 20112220171 is a prime.

It is not a weakly prime, because it can be changed into another prime (20112270187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10056110093 + 10056110094.

It is an arithmetic number, because the mean of its divisors is an integer number (10056110094).

Almost surely, 2^20112220187 is an apocalyptic number.

20112220187 is a deficient number, since it is larger than the sum of its proper divisors (1).

20112220187 is an equidigital number, since it uses as much as digits as its factorization.

20112220187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 26.

Adding to 20112220187 its reverse (78102221102), we get a palindrome (98214441289).

The spelling of 20112220187 in words is "twenty billion, one hundred twelve million, two hundred twenty thousand, one hundred eighty-seven".