20520541 has 4 divisors (see below), whose sum is σ = 21021084. Its totient is φ = 20020000.

The previous prime is 20520527. The next prime is 20520553. The reversal of 20520541 is 14502502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6300100 + 14220441 = 2510^2 + 3771^2 .

It is a cyclic number.

It is not a de Polignac number, because 20520541 - 2⁵ = 20520509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20520571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250210 + ... + 250291.

It is an arithmetic number, because the mean of its divisors is an integer number (5255271).

Almost surely, 2^20520541 is an apocalyptic number.

It is an amenable number.

20520541 is a deficient number, since it is larger than the sum of its proper divisors (500543).

20520541 is an equidigital number, since it uses as much as digits as its factorization.

20520541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500542.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 20520541 is about 4529.9603751026. The cubic root of 20520541 is about 273.7765640771.

The spelling of 20520541 in words is "twenty million, five hundred twenty thousand, five hundred forty-one".