20255447 has 2 divisors, whose sum is σ = 20255448. Its totient is φ = 20255446.

The previous prime is 20255441. The next prime is 20255509. The reversal of 20255447 is 74455202.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20255447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20255441) 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, 10127723 + 10127724.

It is an arithmetic number, because the mean of its divisors is an integer number (10127724).

Almost surely, 2^20255447 is an apocalyptic number.

20255447 is a deficient number, since it is larger than the sum of its proper divisors (1).

20255447 is an equidigital number, since it uses as much as digits as its factorization.

20255447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11200, while the sum is 29.

The square root of 20255447 is about 4500.6051815284. The cubic root of 20255447 is about 272.5925258842.

It can be divided in two parts, 20255 and 447, that added together give a palindrome (20702).

The spelling of 20255447 in words is "twenty million, two hundred fifty-five thousand, four hundred forty-seven".