20538437 has 2 divisors, whose sum is σ = 20538438. Its totient is φ = 20538436.

The previous prime is 20538407. The next prime is 20538439. The reversal of 20538437 is 73483502.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10797796 + 9740641 = 3286^2 + 3121^2 .

It is a cyclic number.

It is not a de Polignac number, because 20538437 - 2⁸ = 20538181 is a prime.

Together with 20538439, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20538439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10269218 + 10269219.

It is an arithmetic number, because the mean of its divisors is an integer number (10269219).

Almost surely, 2^20538437 is an apocalyptic number.

It is an amenable number.

20538437 is a deficient number, since it is larger than the sum of its proper divisors (1).

20538437 is an equidigital number, since it uses as much as digits as its factorization.

20538437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 20538437 is about 4531.9352378427. The cubic root of 20538437 is about 273.8561279604.

The spelling of 20538437 in words is "twenty million, five hundred thirty-eight thousand, four hundred thirty-seven".