20245157 has 2 divisors, whose sum is σ = 20245158. Its totient is φ = 20245156.

The previous prime is 20245151. The next prime is 20245171. The reversal of 20245157 is 75154202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17255716 + 2989441 = 4154^2 + 1729^2 .

It is a cyclic number.

It is not a de Polignac number, because 20245157 - 2²⁴ = 3467941 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20245151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10122578 + 10122579.

It is an arithmetic number, because the mean of its divisors is an integer number (10122579).

Almost surely, 2^20245157 is an apocalyptic number.

It is an amenable number.

20245157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20245157 is an equidigital number, since it uses as much as digits as its factorization.

20245157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 20245157 is about 4499.4618567113. The cubic root of 20245157 is about 272.5463580194.

Adding to 20245157 its reverse (75154202), we get a palindrome (95399359).

It can be divided in two parts, 20245 and 157, that added together give a palindrome (20402).

The spelling of 20245157 in words is "twenty million, two hundred forty-five thousand, one hundred fifty-seven".