20725243 has 12 divisors (see below), whose sum is σ = 26036080. Its totient is φ = 16148880.

The previous prime is 20725241. The next prime is 20725247. The reversal of 20725243 is 34252702.

It is not a de Polignac number, because 20725243 - 2¹ = 20725241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20725241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11388 + ... + 13081.

Almost surely, 2^20725243 is an apocalyptic number.

20725243 is a deficient number, since it is larger than the sum of its proper divisors (5310837).

20725243 is a wasteful number, since it uses less digits than its factorization.

20725243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24498 (or 24487 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 25.

The square root of 20725243 is about 4552.4985447554. The cubic root of 20725243 is about 274.6839034713.

Adding to 20725243 its reverse (34252702), we get a palindrome (54977945).

The spelling of 20725243 in words is "twenty million, seven hundred twenty-five thousand, two hundred forty-three".