20648237 has 2 divisors, whose sum is σ = 20648238. Its totient is φ = 20648236.

The previous prime is 20648233. The next prime is 20648279. The reversal of 20648237 is 73284602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20620681 + 27556 = 4541^2 + 166^2 .

It is a cyclic number.

It is not a de Polignac number, because 20648237 - 2² = 20648233 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 (20648233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10324118 + 10324119.

It is an arithmetic number, because the mean of its divisors is an integer number (10324119).

Almost surely, 2^20648237 is an apocalyptic number.

It is an amenable number.

20648237 is a deficient number, since it is larger than the sum of its proper divisors (1).

20648237 is an equidigital number, since it uses as much as digits as its factorization.

20648237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 20648237 is about 4544.0331204779. The cubic root of 20648237 is about 274.3432792306.

It can be divided in two parts, 2064 and 8237, that added together give a palindrome (10301).

The spelling of 20648237 in words is "twenty million, six hundred forty-eight thousand, two hundred thirty-seven".