20521241 has 12 divisors (see below), whose sum is σ = 22900332. Its totient is φ = 18279744.

The previous prime is 20521217. The next prime is 20521253. The reversal of 20521241 is 14212502.

It can be written as a sum of positive squares in 6 ways, for example, as 235225 + 20286016 = 485^2 + 4504^2 .

It is not a de Polignac number, because 20521241 - 2⁶ = 20521177 is a prime.

It is a super-2 number, since 2×20521241² = 842242664360162, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20521271) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9995 + ... + 11871.

It is an arithmetic number, because the mean of its divisors is an integer number (1908361).

Almost surely, 2^20521241 is an apocalyptic number.

It is an amenable number.

20521241 is a deficient number, since it is larger than the sum of its proper divisors (2379091).

20521241 is a wasteful number, since it uses less digits than its factorization.

20521241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1948 (or 1919 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 20521241 is about 4530.0376378127. The cubic root of 20521241 is about 273.7796770784.

Adding to 20521241 its reverse (14212502), we get a palindrome (34733743).

The spelling of 20521241 in words is "twenty million, five hundred twenty-one thousand, two hundred forty-one".