20245637 has 2 divisors, whose sum is σ = 20245638. Its totient is φ = 20245636.

The previous prime is 20245619. The next prime is 20245649. The reversal of 20245637 is 73654202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18028516 + 2217121 = 4246^2 + 1489^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20245637 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 (20245607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10122818 + 10122819.

It is an arithmetic number, because the mean of its divisors is an integer number (10122819).

Almost surely, 2^20245637 is an apocalyptic number.

It is an amenable number.

20245637 is a deficient number, since it is larger than the sum of its proper divisors (1).

20245637 is an equidigital number, since it uses as much as digits as its factorization.

20245637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 29.

The square root of 20245637 is about 4499.5151961072. The cubic root of 20245637 is about 272.5485119702.

Adding to 20245637 its reverse (73654202), we get a palindrome (93899839).

The spelling of 20245637 in words is "twenty million, two hundred forty-five thousand, six hundred thirty-seven".