20452147 has 2 divisors, whose sum is σ = 20452148. Its totient is φ = 20452146.

The previous prime is 20452123. The next prime is 20452169. The reversal of 20452147 is 74125402.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20452147 is a prime.

It is not a weakly prime, because it can be changed into another prime (20452177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10226073 + 10226074.

It is an arithmetic number, because the mean of its divisors is an integer number (10226074).

Almost surely, 2^20452147 is an apocalyptic number.

20452147 is a deficient number, since it is larger than the sum of its proper divisors (1).

20452147 is an equidigital number, since it uses as much as digits as its factorization.

20452147 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 20452147 is about 4522.4050017662. The cubic root of 20452147 is about 273.4720640519.

Adding to 20452147 its reverse (74125402), we get a palindrome (94577549).

The spelling of 20452147 in words is "twenty million, four hundred fifty-two thousand, one hundred forty-seven".