20725241 has 2 divisors, whose sum is σ = 20725242. Its totient is φ = 20725240.

The previous prime is 20725171. The next prime is 20725247. The reversal of 20725241 is 14252702.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20214016 + 511225 = 4496^2 + 715^2 .

It is a cyclic number.

It is not a de Polignac number, because 20725241 - 2¹⁰ = 20724217 is a prime.

It is a super-2 number, since 2×20725241² = 859071229016162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20725247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10362620 + 10362621.

It is an arithmetic number, because the mean of its divisors is an integer number (10362621).

Almost surely, 2^20725241 is an apocalyptic number.

It is an amenable number.

20725241 is a deficient number, since it is larger than the sum of its proper divisors (1).

20725241 is an equidigital number, since it uses as much as digits as its factorization.

20725241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 20725241 is about 4552.4983250958. The cubic root of 20725241 is about 274.6838946355.

Adding to 20725241 its reverse (14252702), we get a palindrome (34977943).

The spelling of 20725241 in words is "twenty million, seven hundred twenty-five thousand, two hundred forty-one".