20553541 has 4 divisors (see below), whose sum is σ = 20600800. Its totient is φ = 20506284.

The previous prime is 20553529. The next prime is 20553557. The reversal of 20553541 is 14535502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20553541 - 2¹¹ = 20551493 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 (20553521) 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, 22971 + ... + 23848.

It is an arithmetic number, because the mean of its divisors is an integer number (5150200).

Almost surely, 2^20553541 is an apocalyptic number.

It is an amenable number.

20553541 is a deficient number, since it is larger than the sum of its proper divisors (47259).

20553541 is an equidigital number, since it uses as much as digits as its factorization.

20553541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47258.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 20553541 is about 4533.6013278629. The cubic root of 20553541 is about 273.9232429250.

The spelling of 20553541 in words is "twenty million, five hundred fifty-three thousand, five hundred forty-one".