20728041 has 4 divisors (see below), whose sum is σ = 27637392. Its totient is φ = 13818692.

The previous prime is 20728033. The next prime is 20728061. The reversal of 20728041 is 14082702.

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 20728041 - 2³ = 20728033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20728061) 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, 3454671 + ... + 3454676.

It is an arithmetic number, because the mean of its divisors is an integer number (6909348).

Almost surely, 2^20728041 is an apocalyptic number.

It is an amenable number.

20728041 is a deficient number, since it is larger than the sum of its proper divisors (6909351).

20728041 is an equidigital number, since it uses as much as digits as its factorization.

20728041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6909350.

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 20728041 is about 4552.8058381618. The cubic root of 20728041 is about 274.6962640980.

The spelling of 20728041 in words is "twenty million, seven hundred twenty-eight thousand, forty-one".