20423544137 has 2 divisors, whose sum is σ = 20423544138. Its totient is φ = 20423544136.

The previous prime is 20423544107. The next prime is 20423544157. The reversal of 20423544137 is 73144532402.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20421553216 + 1990921 = 142904^2 + 1411^2 .

It is a cyclic number.

It is not a de Polignac number, because 20423544137 - 2⁶ = 20423544073 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20423544097 and 20423544106.

It is not a weakly prime, because it can be changed into another prime (20423544107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10211772068 + 10211772069.

It is an arithmetic number, because the mean of its divisors is an integer number (10211772069).

Almost surely, 2^20423544137 is an apocalyptic number.

It is an amenable number.

20423544137 is a deficient number, since it is larger than the sum of its proper divisors (1).

20423544137 is an equidigital number, since it uses as much as digits as its factorization.

20423544137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 35.

The spelling of 20423544137 in words is "twenty billion, four hundred twenty-three million, five hundred forty-four thousand, one hundred thirty-seven".