20508841 has 4 divisors (see below), whose sum is σ = 21063172. Its totient is φ = 19954512.

The previous prime is 20508833. The next prime is 20508853. The reversal of 20508841 is 14880502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12075625 + 8433216 = 3475^2 + 2904^2 .

It is a cyclic number.

It is not a de Polignac number, because 20508841 - 2³ = 20508833 is a prime.

It is a super-2 number, since 2×20508841² = 841225118326562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20508811) 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, 277110 + ... + 277183.

It is an arithmetic number, because the mean of its divisors is an integer number (5265793).

Almost surely, 2^20508841 is an apocalyptic number.

It is an amenable number.

20508841 is a deficient number, since it is larger than the sum of its proper divisors (554331).

20508841 is an equidigital number, since it uses as much as digits as its factorization.

20508841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554330.

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 20508841 is about 4528.6687889489. The cubic root of 20508841 is about 273.7245219993.

The spelling of 20508841 in words is "twenty million, five hundred eight thousand, eight hundred forty-one".