20523124109 has 2 divisors, whose sum is σ = 20523124110. Its totient is φ = 20523124108.

The previous prime is 20523124087. The next prime is 20523124129. The reversal of 20523124109 is 90142132502.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12159472900 + 8363651209 = 110270^2 + 91453^2 .

It is a cyclic number.

It is not a de Polignac number, because 20523124109 - 2⁸ = 20523123853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20523124129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10261562054 + 10261562055.

It is an arithmetic number, because the mean of its divisors is an integer number (10261562055).

Almost surely, 2^20523124109 is an apocalyptic number.

It is an amenable number.

20523124109 is a deficient number, since it is larger than the sum of its proper divisors (1).

20523124109 is an equidigital number, since it uses as much as digits as its factorization.

20523124109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 29.

The spelling of 20523124109 in words is "twenty billion, five hundred twenty-three million, one hundred twenty-four thousand, one hundred nine".