20023131109 has 2 divisors, whose sum is σ = 20023131110. Its totient is φ = 20023131108.

The previous prime is 20023131071. The next prime is 20023131127. The reversal of 20023131109 is 90113132002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18195312100 + 1827819009 = 134890^2 + 42753^2 .

It is a cyclic number.

It is not a de Polignac number, because 20023131109 - 2⁹ = 20023130597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20023131109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20023131179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10011565554 + 10011565555.

It is an arithmetic number, because the mean of its divisors is an integer number (10011565555).

Almost surely, 2^20023131109 is an apocalyptic number.

It is an amenable number.

20023131109 is a deficient number, since it is larger than the sum of its proper divisors (1).

20023131109 is an equidigital number, since it uses as much as digits as its factorization.

20023131109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 22.

The spelling of 20023131109 in words is "twenty billion, twenty-three million, one hundred thirty-one thousand, one hundred nine".