20463251 has 2 divisors, whose sum is σ = 20463252. Its totient is φ = 20463250.

The previous prime is 20463239. The next prime is 20463269. The reversal of 20463251 is 15236402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20463251 - 2¹⁰ = 20462227 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20463221) 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, 10231625 + 10231626.

It is an arithmetic number, because the mean of its divisors is an integer number (10231626).

Almost surely, 2^20463251 is an apocalyptic number.

20463251 is a deficient number, since it is larger than the sum of its proper divisors (1).

20463251 is an equidigital number, since it uses as much as digits as its factorization.

20463251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 20463251 is about 4523.6325005464. The cubic root of 20463251 is about 273.5215467853.

Adding to 20463251 its reverse (15236402), we get a palindrome (35699653).

The spelling of 20463251 in words is "twenty million, four hundred sixty-three thousand, two hundred fifty-one".