20120203109 has 2 divisors, whose sum is σ = 20120203110. Its totient is φ = 20120203108.

The previous prime is 20120203091. The next prime is 20120203111. The reversal of 20120203109 is 90130202102.

Together with previous prime (20120203091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20100150625 + 20052484 = 141775^2 + 4478^2 .

It is a cyclic number.

It is not a de Polignac number, because 20120203109 - 2¹⁶ = 20120137573 is a prime.

Together with 20120203111, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20120203139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060101554 + 10060101555.

It is an arithmetic number, because the mean of its divisors is an integer number (10060101555).

Almost surely, 2^20120203109 is an apocalyptic number.

It is an amenable number.

20120203109 is a deficient number, since it is larger than the sum of its proper divisors (1).

20120203109 is an equidigital number, since it uses as much as digits as its factorization.

20120203109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The spelling of 20120203109 in words is "twenty billion, one hundred twenty million, two hundred three thousand, one hundred nine".