20125543 has 2 divisors, whose sum is σ = 20125544. Its totient is φ = 20125542.

The previous prime is 20125537. The next prime is 20125583. The reversal of 20125543 is 34552102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20125543 - 2⁹ = 20125031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20125513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10062771 + 10062772.

It is an arithmetic number, because the mean of its divisors is an integer number (10062772).

Almost surely, 2^20125543 is an apocalyptic number.

20125543 is a deficient number, since it is larger than the sum of its proper divisors (1).

20125543 is an equidigital number, since it uses as much as digits as its factorization.

20125543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 20125543 is about 4486.1501312373. The cubic root of 20125543 is about 272.0085376141.

Adding to 20125543 its reverse (34552102), we get a palindrome (54677645).

The spelling of 20125543 in words is "twenty million, one hundred twenty-five thousand, five hundred forty-three".