20545241 has 4 divisors (see below), whose sum is σ = 20633652. Its totient is φ = 20456832.

The previous prime is 20545237. The next prime is 20545243. The reversal of 20545241 is 14254502.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14254502 = 2 ⋅7127251.

It can be written as a sum of positive squares in 2 ways, for example, as 8323225 + 12222016 = 2885^2 + 3496^2 .

It is a cyclic number.

It is not a de Polignac number, because 20545241 - 2² = 20545237 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20545243) 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, 43856 + ... + 44321.

It is an arithmetic number, because the mean of its divisors is an integer number (5158413).

Almost surely, 2^20545241 is an apocalyptic number.

It is an amenable number.

20545241 is a deficient number, since it is larger than the sum of its proper divisors (88411).

20545241 is an equidigital number, since it uses as much as digits as its factorization.

20545241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88410.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 20545241 is about 4532.6858483685. The cubic root of 20545241 is about 273.8863657591.

Adding to 20545241 its reverse (14254502), we get a palindrome (34799743).

The spelling of 20545241 in words is "twenty million, five hundred forty-five thousand, two hundred forty-one".