20020012109 has 2 divisors, whose sum is σ = 20020012110. Its totient is φ = 20020012108.

The previous prime is 20020012063. The next prime is 20020012171. The reversal of 20020012109 is 90121002002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17691660100 + 2328352009 = 133010^2 + 48253^2 .

It is a cyclic number.

It is not a de Polignac number, because 20020012109 - 2²⁰ = 20018963533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20020012189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010006054 + 10010006055.

It is an arithmetic number, because the mean of its divisors is an integer number (10010006055).

Almost surely, 2^20020012109 is an apocalyptic number.

It is an amenable number.

20020012109 is a deficient number, since it is larger than the sum of its proper divisors (1).

20020012109 is an equidigital number, since it uses as much as digits as its factorization.

20020012109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The spelling of 20020012109 in words is "twenty billion, twenty million, twelve thousand, one hundred nine".