20204147 has 2 divisors, whose sum is σ = 20204148. Its totient is φ = 20204146.

The previous prime is 20204117. The next prime is 20204167. The reversal of 20204147 is 74140202.

It is an a-pointer prime, because the next prime (20204167) can be obtained adding 20204147 to its sum of digits (20).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20204147 - 2⁶ = 20204083 is a prime.

It is not a weakly prime, because it can be changed into another prime (20204117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10102073 + 10102074.

It is an arithmetic number, because the mean of its divisors is an integer number (10102074).

Almost surely, 2^20204147 is an apocalyptic number.

20204147 is a deficient number, since it is larger than the sum of its proper divisors (1).

20204147 is an equidigital number, since it uses as much as digits as its factorization.

20204147 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 20204147 is about 4494.9023348678. The cubic root of 20204147 is about 272.3622039902.

Adding to 20204147 its reverse (74140202), we get a palindrome (94344349).

The spelling of 20204147 in words is "twenty million, two hundred four thousand, one hundred forty-seven".