20507841 has 6 divisors (see below), whose sum is σ = 29622450. Its totient is φ = 13671888.

The previous prime is 20507807. The next prime is 20507849. The reversal of 20507841 is 14870502.

It can be written as a sum of positive squares in only one way, i.e., 13727025 + 6780816 = 3705^2 + 2604^2 .

It is not a de Polignac number, because 20507841 - 2⁶ = 20507777 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20507849) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1139316 + ... + 1139333.

It is an arithmetic number, because the mean of its divisors is an integer number (4937075).

Almost surely, 2^20507841 is an apocalyptic number.

It is an amenable number.

20507841 is a deficient number, since it is larger than the sum of its proper divisors (9114609).

20507841 is a wasteful number, since it uses less digits than its factorization.

20507841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2278655 (or 2278652 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 20507841 is about 4528.5583798821. The cubic root of 20507841 is about 273.7200730404.

The spelling of 20507841 in words is "twenty million, five hundred seven thousand, eight hundred forty-one".