20013109 has 2 divisors, whose sum is σ = 20013110. Its totient is φ = 20013108.

The previous prime is 20013107. The next prime is 20013121. The reversal of 20013109 is 90131002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12229009 + 7784100 = 3497^2 + 2790^2 .

It is a cyclic number.

It is not a de Polignac number, because 20013109 - 2¹ = 20013107 is a prime.

It is a super-3 number, since 3×20013109³ (a number of 23 digits) contains 333 as substring.

Together with 20013107, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20013092 and 20013101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20013107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006554 + 10006555.

It is an arithmetic number, because the mean of its divisors is an integer number (10006555).

Almost surely, 2^20013109 is an apocalyptic number.

It is an amenable number.

20013109 is a deficient number, since it is larger than the sum of its proper divisors (1).

20013109 is an equidigital number, since it uses as much as digits as its factorization.

20013109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 20013109 is about 4473.6013456722. The cubic root of 20013109 is about 271.5010542078.

The spelling of 20013109 in words is "twenty million, thirteen thousand, one hundred nine".