20023541 has 4 divisors (see below), whose sum is σ = 20042892. Its totient is φ = 20004192.

The previous prime is 20023537. The next prime is 20023561. The reversal of 20023541 is 14532002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14532002 = 2 ⋅7266001.

It can be written as a sum of positive squares in 2 ways, for example, as 1833316 + 18190225 = 1354^2 + 4265^2 .

It is a cyclic number.

It is not a de Polignac number, because 20023541 - 2² = 20023537 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20023561) 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, 8030 + ... + 10223.

It is an arithmetic number, because the mean of its divisors is an integer number (5010723).

Almost surely, 2^20023541 is an apocalyptic number.

It is an amenable number.

20023541 is a deficient number, since it is larger than the sum of its proper divisors (19351).

20023541 is a wasteful number, since it uses less digits than its factorization.

20023541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19350.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 20023541 is about 4474.7671447797. The cubic root of 20023541 is about 271.5482200766.

Adding to 20023541 its reverse (14532002), we get a palindrome (34555543).

The spelling of 20023541 in words is "twenty million, twenty-three thousand, five hundred forty-one".