20028541 has 16 divisors (see below), whose sum is σ = 22543920. Its totient is φ = 17671680.

The previous prime is 20028529. The next prime is 20028559. The reversal of 20028541 is 14582002.

20028541 is nontrivially palindromic in base 15.

It can be written as a sum of positive squares in 8 ways, for example, as 5808100 + 14220441 = 2410^2 + 3771^2 .

It is not a de Polignac number, because 20028541 - 2⁵ = 20028509 is a prime.

It is a super-2 number, since 2×20028541² = 802284909177362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20028521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27895 + ... + 28603.

It is an arithmetic number, because the mean of its divisors is an integer number (1408995).

Almost surely, 2^20028541 is an apocalyptic number.

It is an amenable number.

20028541 is a deficient number, since it is larger than the sum of its proper divisors (2515379).

20028541 is a wasteful number, since it uses less digits than its factorization.

20028541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 20028541 is about 4475.3257981961. The cubic root of 20028541 is about 271.5708206097.

The spelling of 20028541 in words is "twenty million, twenty-eight thousand, five hundred forty-one".