20736251 has 2 divisors, whose sum is σ = 20736252. Its totient is φ = 20736250.

The previous prime is 20736217. The next prime is 20736257. The reversal of 20736251 is 15263702.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20736251 - 2⁶ = 20736187 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20736251.

It is not a weakly prime, because it can be changed into another prime (20736257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10368125 + 10368126.

It is an arithmetic number, because the mean of its divisors is an integer number (10368126).

Almost surely, 2^20736251 is an apocalyptic number.

20736251 is a deficient number, since it is larger than the sum of its proper divisors (1).

20736251 is an equidigital number, since it uses as much as digits as its factorization.

20736251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 20736251 is about 4553.7073906873. The cubic root of 20736251 is about 274.7325267086.

Adding to 20736251 its reverse (15263702), we get a palindrome (35999953).

The spelling of 20736251 in words is "twenty million, seven hundred thirty-six thousand, two hundred fifty-one".