20514251 has 2 divisors, whose sum is σ = 20514252. Its totient is φ = 20514250.

The previous prime is 20514191. The next prime is 20514253. The reversal of 20514251 is 15241502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20514251 - 2⁶ = 20514187 is a prime.

It is a Sophie Germain prime.

Together with 20514253, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_1301096 and since 20514251 and 1301096 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (20514253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10257125 + 10257126.

It is an arithmetic number, because the mean of its divisors is an integer number (10257126).

Almost surely, 2^20514251 is an apocalyptic number.

20514251 is a deficient number, since it is larger than the sum of its proper divisors (1).

20514251 is an equidigital number, since it uses as much as digits as its factorization.

20514251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 20514251 is about 4529.2660553339. The cubic root of 20514251 is about 273.7485883597.

Adding to 20514251 its reverse (15241502), we get a palindrome (35755753).

The spelling of 20514251 in words is "twenty million, five hundred fourteen thousand, two hundred fifty-one".